{"id":2688,"date":"2024-10-22T14:45:41","date_gmt":"2024-10-22T18:45:41","guid":{"rendered":"https:\/\/spbbeauce.ca\/?p=2688"},"modified":"2024-10-22T14:42:29","modified_gmt":"2024-10-22T18:42:29","slug":"le-syndrome-du-vinaigre-ou-le-cauchemar-des-centres-darchives","status":"publish","type":"post","link":"https:\/\/aw-web.com\/spb-2\/le-syndrome-du-vinaigre-ou-le-cauchemar-des-centres-darchives\/","title":{"rendered":"Le syndrome du vinaigre, ou le cauchemar des centres d&rsquo;archives"},"content":{"rendered":"<p>Le syndrome du vinaigre ne porte pas ce nom pour rien: en effet, ce ph\u00e9nom\u00e8ne, connu et redout\u00e9 des archivistes, se manifeste par une forte odeur rappelant celle du vinaigre. Et on ne parle pas ici du parfum \u00e2cre &#8211; mais r\u00e9confortant &#8211; des effluves vinaigr\u00e9es qui embaument nos maisons lors des traditionnelles conserves de betteraves automnales, mais bien d&rsquo;une odeur forte, d\u00e9sagr\u00e9able et qui peut s&rsquo;av\u00e9rer particuli\u00e8rement irritante pour le nez et les poumons en cas d&rsquo;exposition prolong\u00e9e.<\/p>\n<p>Mais qu&rsquo;est-ce que ce fameux \u00ab\u00a0syndrome du vinaigre\u00a0\u00bb? Quelles sont ses causes? Peut-on l&rsquo;\u00e9viter?<\/p>\n<h2>Le syndrome du vinaigre: qu&rsquo;est-ce que c&rsquo;est au juste?<\/h2>\n<p>Le syndrome du vinaigre se produit lorsque des pellicules ou des n\u00e9gatifs sur supports en ac\u00e9tate de cellulose se d\u00e9gradent; il s&rsquo;en d\u00e9gage alors une forte odeur d&rsquo;acide ac\u00e9tique, un des principaux composants du vinaigre. Ces \u00e9manations ont donc donn\u00e9 \u00e0 ce ph\u00e9nom\u00e8ne le nom de \u00ab\u00a0syndrome du vinaigre\u00a0\u00bb&#8230;et celui-ci est responsable d&rsquo;une v\u00e9ritable course contre la montre dans les centres d&rsquo;archives.<\/p>\n<div id=\"attachment_2732\" style=\"width: 325px\" class=\"wp-caption alignleft\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2732\" class=\" wp-image-2732\" src=\"https:\/\/i0.wp.com\/spbbeauce.ca\/wp-content\/uploads\/2024\/12\/1000006922-225x300.jpg?resize=315%2C420&#038;ssl=1\" alt=\"\" width=\"315\" height=\"420\" srcset=\"https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?resize=225%2C300&amp;ssl=1 225w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?resize=768%2C1024&amp;ssl=1 768w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?resize=1152%2C1536&amp;ssl=1 1152w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?resize=1536%2C2048&amp;ssl=1 1536w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?resize=600%2C800&amp;ssl=1 600w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?resize=700%2C933&amp;ssl=1 700w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?resize=300%2C400&amp;ssl=1 300w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006922-scaled.jpg?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 315px) 100vw, 315px\" \/><p id=\"caption-attachment-2732\" class=\"wp-caption-text\">N\u00e9gatif affect\u00e9 par le syndrome du vinaigre<\/p><\/div>\n<h2>Comment savoir si des archives sont touch\u00e9es par le syndrome du vinaigre?<\/h2>\n<p>Pas besoin d&rsquo;une inspection visuelle pour d\u00e9tecter l&rsquo;apparition de ce ph\u00e9nom\u00e8ne : l&rsquo;odeur caract\u00e9ristique des supports d&rsquo;ac\u00e9tate de cellulose en d\u00e9gradation est suffisante \u00e0 elle seule pour sonner l&rsquo;alarme. Et non seulement les archives touch\u00e9es par le syndrome du vinaigre se d\u00e9gradent, mais ce ph\u00e9nom\u00e8ne est \u00ab\u00a0contagieux\u00a0\u00bb et se r\u00e9pand tr\u00e8s rapidement, d&rsquo;o\u00f9 l&rsquo;importance d&rsquo;agir le plus t\u00f4t possible pour limiter au maximum les dommages.<\/p>\n<h3>Supports en ac\u00e9tate de cellulose: pourquoi les utiliser dans ce cas?<\/h3>\n<p>Les supports en ac\u00e9tate de cellulose sont utilis\u00e9s depuis les ann\u00e9es 20, dans le but de remplacer les supports utilis\u00e9s \u00e0 l&rsquo;\u00e9poque, \u00e0 savoir le nitrate de cellulose, dont l&rsquo;instabilit\u00e9 chimique a entra\u00een\u00e9 de nombreux cas de combustion spontan\u00e9e&#8230;on comprend donc mieux pourquoi on a cherch\u00e9 une solution de remplacement!<\/p>\n<p>La production des pellicules sur support \u00e0 nitrate de cellulose a \u00e9t\u00e9 compl\u00e8tement interrompue en 1951 et ceux en ac\u00e9tate de cellulose ont pris le relais&#8230;enfin pour un temps, car leur stabilit\u00e9 \u00e0 long terme est, comme on l&rsquo;a d\u00e9couvert un peu plus tard, tr\u00e8s volatile (sans mauvais jeu de mots).<\/p>\n<p>C&rsquo;est pourquoi on utilise d\u00e9sormais des supports de polyester qui, avec leur composition chimiquement neutre, r\u00e9sistent au passage du temps et dont la dur\u00e9e de vie est estim\u00e9e \u00e0 plusieurs centaines d&rsquo;ann\u00e9es.<\/p>\n<h2>Quelles sont les cons\u00e9quences du syndrome du vinaigre sur les supports touch\u00e9s?<\/h2>\n<p>Qu&rsquo;il s&rsquo;agisse de pellicules de films, de n\u00e9gatifs ou encore de diapositives, la d\u00e9gradation peut vite \u00eatre consid\u00e9rable, en seulement quelques ann\u00e9es; c&rsquo;est pourquoi il faut agir rapidement et isoler les supports atteints pour limiter la propagation.<\/p>\n<p>Deux r\u00e9actions chimiques sont en cause ici:\u00a0 le radical ac\u00e9tyle et la mol\u00e9cule de cellulose se dissocient en pr\u00e9sence d\u2019humidit\u00e9 et forment de l\u2019acide ac\u00e9tique; cette forte acidit\u00e9 entra\u00eene alors le \u00ab\u00a0bris des liens polym\u00e9riques de l\u2019ac\u00e9tate de cellulose qui (&#8230;) cause sa fragilisation et son r\u00e9tr\u00e9cissement\u00a0\u00bb. (source: Institut canadien de conservation).<\/p>\n<p>Comme le taux d&rsquo;acidit\u00e9 de l\u2019ac\u00e9tate augmente avec le temps, la d\u00e9t\u00e9rioration s&rsquo;en trouve acc\u00e9l\u00e9r\u00e9e; elle est encore plus rapide s&rsquo;il y a beaucoup d&rsquo;humidit\u00e9 et des temp\u00e9ratures \u00e9lev\u00e9es. Les pellicules se d\u00e9gradent alors jusqu&rsquo;\u00e0 devenir compl\u00e8tement inutilisables.<\/p>\n<p>Ce processus endommage les supports de mani\u00e8re in\u00e9gale; la d\u00e9t\u00e9rioration peut toucher une petite partie du n\u00e9gatif ou de la pellicule, causant au d\u00e9part des alt\u00e9rations mineures au niveau de la couleur et de la clart\u00e9, jusqu&rsquo;\u00e0 la destruction irr\u00e9m\u00e9diable du support.<\/p>\n<div id=\"attachment_2730\" style=\"width: 235px\" class=\"wp-caption alignright\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2730\" class=\"size-medium wp-image-2730\" src=\"https:\/\/i0.wp.com\/spbbeauce.ca\/wp-content\/uploads\/2024\/12\/1000006921-225x300.jpg?resize=225%2C300&#038;ssl=1\" alt=\"N\u00e9gatif affect\u00e9 par le syndrome du vinaigre\" width=\"225\" height=\"300\" srcset=\"https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?resize=225%2C300&amp;ssl=1 225w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?resize=768%2C1024&amp;ssl=1 768w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?resize=1152%2C1536&amp;ssl=1 1152w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?resize=1536%2C2048&amp;ssl=1 1536w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?resize=600%2C800&amp;ssl=1 600w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?resize=700%2C933&amp;ssl=1 700w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?resize=300%2C400&amp;ssl=1 300w, https:\/\/i0.wp.com\/aw-web.com\/spb-2\/wp-content\/uploads\/2024\/12\/1000006921-scaled.jpg?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><p id=\"caption-attachment-2730\" class=\"wp-caption-text\">N\u00e9gatif affect\u00e9 par le syndrome du vinaigre<\/p><\/div>\n<h2>Quoi faire en cas de pr\u00e9sence du syndrome du vinaigre?<\/h2>\n<p>En premier lieu, il faut identifier les supports touch\u00e9s et les isoler rapidement du reste de la collection pour \u00e9viter une propagation acc\u00e9l\u00e9r\u00e9e du ph\u00e9nom\u00e8ne. Si les supports ne sont pas trop endommag\u00e9s, leur num\u00e9risation s&rsquo;impose pour pouvoir garder une trace de leur contenu d&rsquo;origine.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le syndrome du vinaigre ne porte pas ce nom pour rien: en effet, ce ph\u00e9nom\u00e8ne, connu et redout\u00e9 des archivistes, se manifeste par une forte odeur rappelant celle du vinaigre. Et on ne parle pas ici du parfum \u00e2cre &#8211; mais r\u00e9confortant &#8211; des effluves&#8230;<\/p>\n","protected":false},"author":2,"featured_media":2728,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-2688","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogue"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le syndrome du vinaigre, ou le cauchemar des centres d&#039;archives - Soci\u00e9t\u00e9 du patrimoine des Beaucerons<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aw-web.com\/spb-2\/le-syndrome-du-vinaigre-ou-le-cauchemar-des-centres-darchives\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le syndrome du vinaigre, ou le cauchemar des centres d&#039;archives - Soci\u00e9t\u00e9 du patrimoine des Beaucerons\" \/>\n<meta property=\"og:description\" content=\"Le syndrome du vinaigre ne porte pas ce nom pour rien: en effet, ce ph\u00e9nom\u00e8ne, connu et redout\u00e9 des archivistes, se manifeste par une forte odeur rappelant celle du vinaigre. 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