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{"id":15951,"date":"2019-03-12T11:00:08","date_gmt":"2019-03-12T15:00:08","guid":{"rendered":"http:\/\/circulatingnow.nlm.nih.gov\/?p=15951"},"modified":"2021-07-19T08:58:46","modified_gmt":"2021-07-19T12:58:46","slug":"hosting-the-washington-conservation-guild","status":"publish","type":"post","link":"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/","title":{"rendered":"Hosting the Washington Conservation Guild"},"content":{"rendered":"<p><em>By Stephen J. Greenberg ~<\/em><\/p>\n<p>Last month, on February 7, 2019, forty-five members of the <a href=\"https:\/\/washingtonconservationguild.org\/\">Washington Conservation Guild<\/a> (WCG) held their floating <a href=\"https:\/\/washingtonconservationguild.org\/2019\/01\/24\/wcg-meeting-national-library-medicine\/\">monthly meeting<\/a> in the Rotunda and <a href=\"https:\/\/www.nlm.nih.gov\/hmd\/visit\/reading-room.html\">History of Medicine Reading Room<\/a> at the National Library of Medicine. The Guild is a nonpro\ufb01t organization of conservation professionals dedicated to preserving art and historic materials. Founded in 1967, WCG serves as a regional forum for its members. As their website states:<\/p>\n<blockquote><p>WCG is based in Washington, D.C., and draws its membership primarily from Washington, Maryland, and northern Virginia. Members represent a wide cross-section of the conservation community and allied professions. They work in government, state, and private museums, studios, and laboratories, and other cultural and academic institutions and organizations.<\/p><\/blockquote>\n<p>The Guild\u2019s visit included a guided viewing of some of NLM\u2019s oldest and rarest books led by its staff of rare book librarians, and presentations by three Guild members, two of whom are conservators at NLM, and whose work <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/tag\/conservation\/\">will already be familiar<\/a> to regular readers of <em>Circulating Now.<\/em><\/p>\n<figure id=\"attachment_15953\" aria-describedby=\"caption-attachment-15953\" style=\"width: 300px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-holly.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"15953\" data-permalink=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/wcg-holly\/\" data-orig-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-holly.jpg?fit=1600%2C1200&ssl=1\" data-orig-size=\"1600,1200\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"1.7","credit":"","camera":"LEICA Q (Typ 116)","caption":"","created_timestamp":"1549562611","copyright":"","focal_length":"28","iso":"1600","shutter_speed":"0.00625","title":"","orientation":"1"}\" data-image-title=\"WCG Holly\" data-image-description=\"\" data-image-caption=\"<p>Holly Herro speaks to the Washington Conservation Guild in the NLM History of Medicine Reading Room. Kristi Wright prepares to speak.<\/p>\n\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-holly.jpg?fit=300%2C225&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-holly.jpg?fit=840%2C630&ssl=1\" class=\"size-medium wp-image-15953\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-holly.jpg?resize=300%2C225&ssl=1\" alt=\"A woman at a podium by a large video screen speaks to a gathering in a book lined room.\" width=\"300\" height=\"225\" \/><\/a><figcaption id=\"caption-attachment-15953\" class=\"wp-caption-text\">Holly Herro speaks to the Washington Conservation Guild in the NLM History of Medicine Reading Room. Kristi Wright prepares to speak.<\/figcaption><\/figure>\n<p>Holly Herro, NLM Senior Conservator, and Kristi Wright, NLM Contract Conservator, spoke about three ongoing conservation projects at NLM. The first is the <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2017\/12\/21\/an-airtight-case-custom-fabrication-for-a-medical-history-treasure\/\">ongoing research to fabricate an inexpensive anoxic frame<\/a> for the Marshall Nirenberg DNA map. The frame is now fully operational, but the testing and monitoring of the frame goes on. In particular, Herro and Wright need to monitor the integrity of the O-ring seals, in order to ensure that proper levels of argon are maintained inside the frame.<\/p>\n<div class=\"tiled-gallery type-rectangular tiled-gallery-unresized\" data-original-width=\"840\" data-carousel-extra='{"blog_id":1,"permalink":"https:\\\/\\\/circulatingnow.nlm.nih.gov\\\/2019\\\/03\\\/12\\\/hosting-the-washington-conservation-guild\\\/","likes_blog_id":"52242398"}' itemscope itemtype=\"http:\/\/schema.org\/ImageGallery\" > <div class=\"gallery-row\" style=\"width: 840px; height: 484px;\" data-original-width=\"840\" data-original-height=\"484\" > <div class=\"gallery-group images-2\" style=\"width: 315px; height: 484px;\" data-original-width=\"315\" data-original-height=\"484\" > <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/2019-03-04_15-50-16\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"311\"> <meta itemprop=\"height\" content=\"168\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"15963\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-50-16.jpg\" data-orig-size=\"1828,985\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"2019-03-04_15-50-16\" data-image-description=\"<p>Nirenberg frame cross section.<\/p> \" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-50-16.jpg?fit=300%2C162&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-50-16.jpg?fit=840%2C453&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-50-16.jpg?w=311&h=168&ssl=1\" width=\"311\" height=\"168\" loading=\"lazy\" data-original-width=\"311\" data-original-height=\"168\" itemprop=\"http:\/\/schema.org\/image\" title=\"2019-03-04_15-50-16\" alt=\"A crossection drawing of the elements of an airtight frame.\" style=\"width: 311px; height: 168px;\" \/> <\/a> <\/div> <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2014\/01\/17\/protecting-the-past-a-study-of-acetic-acid-offgassing\/nirenberg_chart_jjbccw\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"311\"> <meta itemprop=\"height\" content=\"308\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"3022\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2014\/01\/nirenberg_chart_jjbccw.jpg\" data-orig-size=\"1600,1584\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"Copyright (C) reserved","focal_length":"0","iso":"0","shutter_speed":"0","title":""}\" data-image-title=\"Nirenberg Chart\" data-image-description=\"<p>By 1966, Nirenberg announced that he had deciphered the 64 RNA codons for all 20 amino acids. This chart from 1965 lists the correspondence between these codons and amino acids.<br \/> JJBCCW<\/p> \" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2014\/01\/nirenberg_chart_jjbccw.jpg?fit=300%2C297&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2014\/01\/nirenberg_chart_jjbccw.jpg?fit=840%2C832&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2014\/01\/nirenberg_chart_jjbccw.jpg?w=311&h=308&ssl=1\" width=\"311\" height=\"308\" loading=\"lazy\" data-original-width=\"311\" data-original-height=\"308\" itemprop=\"http:\/\/schema.org\/image\" title=\"Nirenberg Chart\" alt=\"A large paper chart constructed of serveral pages taped together, handwritten in several colors of ink.\" style=\"width: 311px; height: 308px;\" \/> <\/a> <div class=\"tiled-gallery-caption\" itemprop=\"caption description\"> Nirenberg’s handwritten genetic code chart, 1965. <a href=\"http:\/\/profiles.nlm.nih.gov\/ps\/retrieve\/ResourceMetadata\/JJBCCW\" rel=\"nofollow\">http:\/\/profiles.nlm.nih.gov\/ps\/retrieve\/ResourceMetadata\/JJBCCW<\/a> <\/div> <\/div> <\/div> <!-- close group --> <div class=\"gallery-group images-1\" style=\"width: 525px; height: 484px;\" data-original-width=\"525\" data-original-height=\"484\" > <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2017\/12\/21\/an-airtight-case-custom-fabrication-for-a-medical-history-treasure\/enclosure-with-chart\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"521\"> <meta itemprop=\"height\" content=\"480\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"13065\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2017\/10\/enclosure-with-chart1.jpg\" data-orig-size=\"1747,1608\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"1"}\" data-image-title=\"enclosure with chart\" data-image-description=\"\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2017\/10\/enclosure-with-chart1.jpg?fit=300%2C276&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2017\/10\/enclosure-with-chart1.jpg?fit=840%2C773&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2017\/10\/enclosure-with-chart1.jpg?w=521&h=480&ssl=1\" width=\"521\" height=\"480\" loading=\"lazy\" data-original-width=\"521\" data-original-height=\"480\" itemprop=\"http:\/\/schema.org\/image\" title=\"enclosure with chart\" alt=\"A chart in its oxygen-free case.\" style=\"width: 521px; height: 480px;\" \/> <\/a> <div class=\"tiled-gallery-caption\" itemprop=\"caption description\"> The enclosure is constructed from aluminum, glass, and o-rings. Argon levels will be monitored to establish a long term maintenance schedule. <\/div> <\/div> <\/div> <!-- close group --> <\/div> <!-- close row --> <div class=\"gallery-row\" style=\"width: 840px; height: 238px;\" data-original-width=\"840\" data-original-height=\"238\" > <div class=\"gallery-group images-1\" style=\"width: 331px; height: 238px;\" data-original-width=\"331\" data-original-height=\"238\" > <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/l1000318\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"327\"> <meta itemprop=\"height\" content=\"234\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"15670\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000318.jpg\" data-orig-size=\"1600,1143\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"L1000318\" data-image-description=\"\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000318.jpg?fit=300%2C214&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000318.jpg?fit=840%2C600&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000318.jpg?w=327&h=234&ssl=1\" width=\"327\" height=\"234\" loading=\"lazy\" data-original-width=\"327\" data-original-height=\"234\" itemprop=\"http:\/\/schema.org\/image\" title=\"L1000318\" alt=\"A woman aligns a plastic enclosed paper on the bed of a machine.\" style=\"width: 327px; height: 234px;\" \/> <\/a> <div class=\"tiled-gallery-caption\" itemprop=\"caption description\"> Kristi positions the page in its sleeve on the Minter Welder. <\/div> <\/div> <\/div> <!-- close group --> <div class=\"gallery-group images-1\" style=\"width: 178px; height: 238px;\" data-original-width=\"178\" data-original-height=\"238\" > <div class=\"tiled-gallery-item tiled-gallery-item-small\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2018\/05\/07\/facts-and-inferences-digitizing-shadows-from-the-walls-of-death-part-1\/title-0234555\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"174\"> <meta itemprop=\"height\" content=\"234\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"14515\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/05\/title-0234555.jpg\" data-orig-size=\"893,1200\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"1"}\" data-image-title=\"Titlepage for Shadows from the Walls of Death\" data-image-description=\"<p>titlepage-0234555<br \/> SHADOWS<br \/> FROM THE<br \/> WALLS OF DEATH;<br \/> BEING<br \/> ARSENICAL WALL PAPERS,<br \/> GATHERED BY R. C. KEDZIE,<br \/> Hi<br \/> Member of State Board of Health.<br \/> Presented by the State Board of Health, of Michigan. <\/p> \" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/05\/title-0234555.jpg?fit=223%2C300&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/05\/title-0234555.jpg?fit=762%2C1024&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/05\/title-0234555.jpg?w=174&h=234&ssl=1\" width=\"174\" height=\"234\" loading=\"lazy\" data-original-width=\"174\" data-original-height=\"234\" itemprop=\"http:\/\/schema.org\/image\" title=\"Titlepage for Shadows from the Walls of Death\" alt=\"Title page for Shadows from the Walls of Death.\" style=\"width: 174px; height: 234px;\" \/> <\/a> <\/div> <\/div> <!-- close group --> <div class=\"gallery-group images-1\" style=\"width: 331px; height: 238px;\" data-original-width=\"331\" data-original-height=\"238\" > <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/l1000358\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"327\"> <meta itemprop=\"height\" content=\"234\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"15675\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000358.jpg\" data-orig-size=\"1600,1143\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"L1000358\" data-image-description=\"\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000358.jpg?fit=300%2C214&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000358.jpg?fit=840%2C600&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2018\/12\/L1000358.jpg?w=327&h=234&ssl=1\" width=\"327\" height=\"234\" loading=\"lazy\" data-original-width=\"327\" data-original-height=\"234\" itemprop=\"http:\/\/schema.org\/image\" title=\"L1000358\" alt=\"Three women pose with the completed album open in front of them.\" style=\"width: 327px; height: 234px;\" \/> <\/a> <div class=\"tiled-gallery-caption\" itemprop=\"caption description\"> Holly, Kristi, and Katie Wagner hold up the completed book. <\/div> <\/div> <\/div> <!-- close group --> <\/div> <!-- close row --> <\/div>\n<p>Another topic covered by Herro and Wright was the <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/01\/03\/closing-the-book-on-shadows-from-the-walls-of-death\/\">now-completed encapsulation<\/a> of the arsenic-laden pages of <em>Shadows from the Walls of Death<\/em>, the 19th century book of toxic wallpaper samples. Now that the encapsulation is completed, the book has been returned to the NLM stacks for examination and use by scholars and the just-curious.\u00a0 <em>Shadows<\/em> has become a favorite of the groups taking tours of NLM and of the History of Medicine Division Reading Room in particular.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-01_16-42-23.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"15964\" data-permalink=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/2019-03-01_16-42-23\/\" data-orig-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-01_16-42-23.jpg?fit=1023%2C578&ssl=1\" data-orig-size=\"1023,578\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"The Leather Discussion Group.\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-01_16-42-23.jpg?fit=300%2C170&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-01_16-42-23.jpg?fit=840%2C475&ssl=1\" class=\"alignright size-medium wp-image-15964\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-01_16-42-23.jpg?resize=300%2C170&ssl=1\" alt=\"The Leather Discussion Group: PennState University Libraries, Smithsonian Libraries and the U.S. National Library of Medicine, NIH.\" width=\"300\" height=\"170\" \/><\/a>The third project discussed by Herro and Wright is their newest.\u00a0 Working in conjunction with their counterparts at Penn State University and Smithsonian Institution Libraries, Herro and Wright are launching a new effort to better understand how the leather in historic bookbindings ages and deteriorates, and why modern binding leather, from the same species of animal but tanned, dyed, and prepared by modern methods, clearly ages differently and in many cases far less well than traditionally prepared leathers.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-49-32.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"15965\" data-permalink=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/2019-03-04_15-49-32\/\" data-orig-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-49-32-e1566584273654.jpg?fit=813%2C558&ssl=1\" data-orig-size=\"813,558\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"Leather Samples\" data-image-description=\"\" data-image-caption=\"<p>Samples Collected by the Leather Discussion Group<\/p>\n\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-49-32-e1566584273654.jpg?fit=300%2C206&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-49-32-e1566584273654.jpg?fit=813%2C558&ssl=1\" class=\"aligncenter size-large wp-image-15965\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-49-32.jpg?resize=840%2C293&ssl=1\" alt=\"Photogaphs of old and new leather in many colors.\" width=\"840\" height=\"293\" \/><\/a><\/p>\n<p>The preservation of binding leathers has always been a knotty problem.\u00a0 The exact species of leather (calf, sheep, goat, pigskin, vellum, parchment, even buckskin) is often difficult to determine, but each will need different conservation and storage.\u00a0 Moreover, modern leather simply doesn\u2019t age well, and it is not clear why.\u00a0 The \u201cLeather Discussion Group\u201d will be using all of the modern technology at its disposal (DNA analysis of the leather, qualitative analysis of the modern and traditional chemicals used, even examining animal husbandry practices) to puzzle out the differences.<\/p>\n<figure id=\"attachment_15966\" aria-describedby=\"caption-attachment-15966\" style=\"width: 300px\" class=\"wp-caption alignright\"><a href=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-justine.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"15966\" data-permalink=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/wcg-justine\/\" data-orig-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-justine.jpg?fit=1600%2C1200&ssl=1\" data-orig-size=\"1600,1200\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"1.7","credit":"","camera":"LEICA Q (Typ 116)","caption":"","created_timestamp":"1549564510","copyright":"","focal_length":"28","iso":"1600","shutter_speed":"0.004","title":"","orientation":"1"}\" data-image-title=\"WCG Justine\" data-image-description=\"\" data-image-caption=\"<p>Justine P. Bello speaks to the Washington Conservation Guild in the NLM History of Medicine Reading Room<\/p>\n\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-justine.jpg?fit=300%2C225&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-justine.jpg?fit=840%2C630&ssl=1\" class=\"size-medium wp-image-15966\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/wcg-justine.jpg?resize=300%2C225&ssl=1\" alt=\"A woman at a podium by a large video screen speaks to a gathering in a book lined room.\" width=\"300\" height=\"225\" \/><\/a><figcaption id=\"caption-attachment-15966\" class=\"wp-caption-text\">Justine P. Bello speaks to the Washington Conservation Guild in the NLM History of Medicine Reading Room<\/figcaption><\/figure>\n<p>The third speaker was architectural conservator Justine P. Bello who discussed the effort of the National Park Service to clean the dome of the Thomas Jefferson Memorial of a particularly stubborn and mysterious grime that is disfiguring the famous building. Many theories have been advanced about the source of the discoloration: airplane exhaust fumes (the Memorial is on the approach path to Reagan National Airport), some sort of fungus, or just too much automobile traffic in downtown DC.\u00a0 Research show that the grime was in fact a biofilm with fungal, bacterial, and algal components.\u00a0 There were concerns that the biofilm was actually damaging the stone.<\/p>\n<p>But how to clean it?\u00a0 Solvents, including even water-based cleaners and detergents, were out of the question, given the sensitive ecosystem of the Tidal Basin. Liquid residue would inevitably get into the surrounding waterways. Moreover, abrasives would certainly damage the stone.\u00a0 It was finally determined that a laser could be used to clean the stone.\u00a0 Lasers used no water or abrasives, they were gentle on both the environment and the building stone, and could be done a bit at a time. Finally, lasers left a natural-looking result\u2014nothing was to look \u201ctoo clean.\u201d The majority of Bello\u2019s presentation described the intricate choreography of the test cleaning of a selected area of the dome. The equipment was heavy, delicate, and the supporting scaffolding could NOT rest upon the historical building.\u00a0 But the <a href=\"https:\/\/www.nps.gov\/nama\/learn\/news\/biofilmupdate.htm\">test cleaning was a success<\/a>, and the National Park Service is <a href=\"https:\/\/www.nps.gov\/nama\/learn\/news\/jeffersonrestoration.htm\">moving ahead to clean the entire memorial<\/a>.\u00a0 The project is expected to be complete by May of 2020.<\/p>\n<div class=\"tiled-gallery type-rectangular tiled-gallery-unresized\" data-original-width=\"840\" data-carousel-extra='{"blog_id":1,"permalink":"https:\\\/\\\/circulatingnow.nlm.nih.gov\\\/2019\\\/03\\\/12\\\/hosting-the-washington-conservation-guild\\\/","likes_blog_id":"52242398"}' itemscope itemtype=\"http:\/\/schema.org\/ImageGallery\" > <div class=\"gallery-row\" style=\"width: 840px; height: 379px;\" data-original-width=\"840\" data-original-height=\"379\" > <div class=\"gallery-group images-1\" style=\"width: 568px; height: 379px;\" data-original-width=\"568\" data-original-height=\"379\" > <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/2019-03-04_15-41-41\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"564\"> <meta itemprop=\"height\" content=\"375\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"15970\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-41-41.jpg\" data-orig-size=\"1429,952\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"2019-03-04_15-41-41\" data-image-description=\"<p>Image from the presentation “Laser Cleaning at the Thomas Jefferson Memorial: A Test Case and Evaluation” by Justine P Bello Architectural Conservator, National Park Service, National Capital Region Professional Associate, AIC to the Washington Conservation Guild on February 7, 2019.<\/p> \" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-41-41.jpg?fit=300%2C200&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-41-41.jpg?fit=840%2C560&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-41-41.jpg?w=564&h=375&ssl=1\" width=\"564\" height=\"375\" loading=\"lazy\" data-original-width=\"564\" data-original-height=\"375\" itemprop=\"http:\/\/schema.org\/image\" title=\"2019-03-04_15-41-41\" alt=\"An aerial view of the Jefferson Memorial showing a cleaned section of the dome.\" style=\"width: 564px; height: 375px;\" \/> <\/a> <div class=\"tiled-gallery-caption\" itemprop=\"caption description\"> An aerial view of the Memorial at the completion of the test treatment. <\/div> <\/div> <\/div> <!-- close group --> <div class=\"gallery-group images-2\" style=\"width: 272px; height: 379px;\" data-original-width=\"272\" data-original-height=\"379\" > <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/2019-03-04_15-40-35\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"268\"> <meta itemprop=\"height\" content=\"183\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"15971\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-40-35.jpg\" data-orig-size=\"1428,976\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"2019-03-04_15-40-35\" data-image-description=\"<p>Image from the presentation “Laser Cleaning at the Thomas Jefferson Memorial: A Test Case and Evaluation” by Justine P Bello Architectural Conservator, National Park Service, National Capital Region Professional Associate, AIC to the Washington Conservation Guild on February 7, 2019.<\/p> \" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-40-35.jpg?fit=300%2C205&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-40-35.jpg?fit=840%2C574&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-40-35.jpg?w=268&h=183&ssl=1\" width=\"268\" height=\"183\" loading=\"lazy\" data-original-width=\"268\" data-original-height=\"183\" itemprop=\"http:\/\/schema.org\/image\" title=\"2019-03-04_15-40-35\" alt=\"A close up of the stone of the Jefferson Memorial showing the dark colored biofilm and a cleaned section.\" style=\"width: 268px; height: 183px;\" \/> <\/a> <div class=\"tiled-gallery-caption\" itemprop=\"caption description\"> The stone of the Memorial before and after cleaning with the laser. <\/div> <\/div> <div class=\"tiled-gallery-item tiled-gallery-item-large\" itemprop=\"associatedMedia\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"> <a href=\"https:\/\/circulatingnow.nlm.nih.gov\/2019\/03\/12\/hosting-the-washington-conservation-guild\/2019-03-04_15-38-39\/\" border=\"0\" itemprop=\"url\"> <meta itemprop=\"width\" content=\"268\"> <meta itemprop=\"height\" content=\"188\"> <img decoding=\"async\" class=\"\" data-attachment-id=\"15972\" data-orig-file=\"https:\/\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-38-39.jpg\" data-orig-size=\"737,516\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}\" data-image-title=\"2019-03-04_15-38-39\" data-image-description=\"<p>Image from the presentation “Laser Cleaning at the Thomas Jefferson Memorial: A Test Case and Evaluation” by Justine P Bello Architectural Conservator, National Park Service, National Capital Region Professional Associate, AIC to the Washington Conservation Guild on February 7, 2019.<\/p> \" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-38-39.jpg?fit=300%2C210&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-38-39.jpg?fit=737%2C516&ssl=1\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/2019-03-04_15-38-39.jpg?w=268&h=188&ssl=1\" width=\"268\" height=\"188\" loading=\"lazy\" data-original-width=\"268\" data-original-height=\"188\" itemprop=\"http:\/\/schema.org\/image\" title=\"2019-03-04_15-38-39\" alt=\"A view of the scaffolding from the top of the Jefferson Memorial dome.\" style=\"width: 268px; height: 188px;\" \/> <\/a> <div class=\"tiled-gallery-caption\" itemprop=\"caption description\"> A view from the top of the scaffolding constructed for the test cleaning. <\/div> <\/div> <\/div> <!-- close group --> <\/div> <!-- close row --> <\/div>\n<p>There do remain some unanswered questions, most importantly, will the biofilm come back after the cleaning. There are no answers yet, but Bello and her colleagues will be watching very, very carefully.<\/p>\n<p><i><a href=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2015\/11\/steve-by-bill.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"8166\" data-permalink=\"https:\/\/circulatingnow.nlm.nih.gov\/2016\/12\/06\/a-nurses-scrapbook-from-the-great-war\/steve-by-bill\/\" data-orig-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2015\/11\/steve-by-bill.jpg?fit=1200%2C1600&ssl=1\" data-orig-size=\"1200,1600\" data-comments-opened=\"1\" data-image-meta=\"{"aperture":"2","credit":"","camera":"DSC-RX1","caption":"","created_timestamp":"1445167342","copyright":"","focal_length":"35","iso":"200","shutter_speed":"0.0025","title":"","orientation":"1"}\" data-image-title=\"Steven Greenberg\" data-image-description=\"<p> by Bill<\/p>\n\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2015\/11\/steve-by-bill.jpg?fit=225%2C300&ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2015\/11\/steve-by-bill.jpg?fit=768%2C1024&ssl=1\" class=\"alignleft wp-image-8166\" src=\"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2015\/11\/steve-by-bill.jpg?resize=79%2C105&ssl=1\" alt=\"\" width=\"79\" height=\"105\" \/><\/a><em>Stephen J. Greenberg, PhD, is Head of Rare Books and Early Manuscripts for the History of Medicine Division at the National Library of Medicine.<\/em><\/i><\/p>\n<p><em>Photographs of the event by <\/em><i>the author.<br \/>\n<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"<p>By Stephen J. Greenberg ~ Last month, on February 7, 2019, forty-five members of the Washington Conservation Guild (WCG) held<\/p>\n","protected":false},"author":19605840,"featured_media":15977,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[12763,103],"tags":[23993,149,340879,393736,281858],"class_list":["post-15951","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-collections","category-news","tag-conservation","tag-hosting","tag-national-park-service","tag-rare-books","tag-smithsonian"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/circulatingnow.nlm.nih.gov\/wp-content\/uploads\/2019\/03\/frame_feature.jpg?fit=900%2C401&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p3xcDk-49h","jetpack-related-posts":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/posts\/15951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/users\/19605840"}],"replies":[{"embeddable":true,"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/comments?post=15951"}],"version-history":[{"count":17,"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/posts\/15951\/revisions"}],"predecessor-version":[{"id":21698,"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/posts\/15951\/revisions\/21698"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/media\/15977"}],"wp:attachment":[{"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/media?parent=15951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/categories?post=15951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/circulatingnow.nlm.nih.gov\/wp-json\/wp\/v2\/tags?post=15951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} |