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<p>[QUOTE="2manybooks, post: 9801435, member: 8267"]The images appear to be a type of photograph known as a solar enlargement. The process was most popular from the 1880s to about the 1930s, after the introduction of more sensitive gelatin-bromide photographic papers. It was common to "work-up", or touch up, the images with graphite and/or colored paints or crayons. </p><p><br /></p><p>Here is an article explaining the history and process - </p><p><br /></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>[/QUOTE]</p><p><br /></p>
[QUOTE="2manybooks, post: 9801435, member: 8267"]The images appear to be a type of photograph known as a solar enlargement. The process was most popular from the 1880s to about the 1930s, after the introduction of more sensitive gelatin-bromide photographic papers. It was common to "work-up", or touch up, the images with graphite and/or colored paints or crayons. Here is an article explaining the history and process - [URL]http://resources.culturalheritage.org/pmgtopics/2005-volume-eleven/11_14_Whitman.pdf[/URL][/QUOTE]
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