a web page with good basic info on glass plate negatives and their
preservation is http://slisweb.lis.wisc.edu/~hamuir/678/glass.html
"T. Arron
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> Subject: Early photography question
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HISTORICAL
ARCHAEOLOGY
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08/10/2006 03:04
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Please respond to
HISTORICAL
ARCHAEOLOGY
Hello all. A friend of a colleague of mine is looking for information
regarding what might be early photographic materials. She wrote:
"A friend has some old glass
plates with a black powdery material on the back,
with sketches of some of the old Ishpeming
mines. I assume they were for making photographs,
but am not sure. He'd like to get a little
history on them."
Any thoughts? Many thanks for your input.
-T. Arron Kotlensky