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Maps-L: Map Librarians, etc.

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Subject:
From:
Michael Holt <[log in to unmask]>
Reply To:
Maps-L: Map Librarians, etc.
Date:
Sun, 22 May 2016 00:22:03 -0400
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I have encountered some reproductions of maps from the early 1600s.   
They're on that fake parchment that is also used on the reproductions of 
the Declaration of Independence (also on the same wall).  What is it 
that causes those documents to turn dark with exposure to the sun?  Is 
there some way to remove it?




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