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<p>[QUOTE=&quot;Figtree3, post: 566996, member: 33&quot;]That technique was popular over a long period of time, from about the 1850s to the 1930s. It was invented in the 1850s. Here is some information. Besides solar enlargements, other names by which they were known were crayon portraits and crayon enlargements (although crayon was not always the material used for going over the photos).</p><p><br /></p><p><a href="http://sgarwood.com/node/52" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://sgarwood.com/node/52" rel="nofollow">http://sgarwood.com/node/52</a></p><p><br /></p><p>This one is a pdf file, an article that goes over the history and some technical aspects: <a href="http://resources.conservation-us.org/pmgtopics/1989-volume-three/03_05_Albright.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://resources.conservation-us.org/pmgtopics/1989-volume-three/03_05_Albright.pdf" rel="nofollow">http://resources.conservation-us.org/pmgtopics/1989-volume-three/03_05_Albright.pdf</a>[/QUOTE]</p><p><br /></p>

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