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<p>[QUOTE=&quot;Frank, post: 9257849, member: 5421&quot;]Ambrotypes were done on glass, using essentially the same collodion emulsion as tintypes. A regular ambrotype was done on clear glass, and appeared as a negative image until a dark backing was applied to the reverse of the glass. The backing could be either a dark varnish or paint, or the image could be cased against a black cloth. A ruby ambrotype was done on dark glass, so it didn&#039;t need a dark backing to be viewed as a positive. I&#039;ve seen examples done on purple, black, or red glass.</p><p><br /></p><p>I don&#039;t see anything to indicate that the image above is military.[/QUOTE]</p><p><br /></p>

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