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<p>[QUOTE=&quot;2manybooks, post: 2496330, member: 8267&quot;]Here is an article that explains the techniques of solar enlargements:</p><p><a href="http://resources.culturalheritage.org/pmgtopics/2005-volume-eleven/11_14_Whitman.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://resources.culturalheritage.org/pmgtopics/2005-volume-eleven/11_14_Whitman.pdf" rel="nofollow">http://resources.culturalheritage.org/pmgtopics/2005-volume-eleven/11_14_Whitman.pdf</a></p><p><br /></p><p>It seems likely that both your first image, as well as the crayon portrait, are solar enlargements. Different methods of retouching/enhancing were used. The process was most popular between the 1880s and the 1930s.&nbsp; </p><p><br /></p><p>As for their conservation, the best approach might be to simply place them in large archival folders or a box designed for photographic materials. Light Impressions is a company that specializes in archival materials for care of photographs:</p><p><a href="http://www.lightimpressionsdirect.com/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.lightimpressionsdirect.com/" rel="nofollow">http://www.lightimpressionsdirect.com/</a></p><p>Removing them from their backing boards would be a delicate, and probably expensive, process best left to a professional conservator.[/QUOTE]</p><p><br /></p>

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