Thread: Black Light Discussion:
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  #36  
Old 01-13-2022, 02:05 PM
lumberjack lumberjack is offline
Mic.hael Mu.mby
 
Join Date: Apr 2018
Posts: 151
Default blacklight
I don't believe anyone mentioned the use of a blacklight to determine the age of photographs. It isn't foolproof, brightener was added to photo paper sometime in the early fifties, but it is a tool.
lumberjack
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