In a message dated 02-04-19 13:22:46 EDT, Shawn wrote:

<< Also, if anyone can answer this question, what kind of damage is done to
 photographs, art plates, postcards, etc...by scanning and photocopying. We do
 not allow flash photography due to the damage it causes but did not know
 about scanners and photocopiers. >>

I'm not sure why you don't allow flash photography, as it's usually
considered safer than the normal photographic alternative, involving
prolonged exposure to hot, bright floodlights in a copy stand situation.  You
set up and focus with dim modeling lights, then use electronic flash for the
exposure.  A number of people have done studies with scanners and office
copiers and have concluded that they're harmless with most materials.
Unnecessary, repeated copying and scanning, however, can cause cumulative
damage.  This is why it's a good idea to scan something right the first time,
just once, and not subject the object to repeated scanning at successively
higher resolution.

Really light-sensitive items, such as early salted-paper photographs,
1840s-1860, and fading color prints, are more safely photographed with
electronic flash.  If you need scans, you can scan the copy negatives or
transparencies.

David Haberstich

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