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All Forums Category: General Philatelic Discussions (Non Country Specific) Forum: Philatelic Book, Reference, Supply and Software

Hinges And Ph Salm Foundation 1992

 
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angore
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Posted 01/23/2026   1:46 pm  Show Profile Bookmark this topic Add angore to your friends list Get a Link to this Message
This report from 1992 Salm Foundation shows hinges when new are acidic. Glassine is paper after all. It Interesting that the pH increased in most cases after aging.

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Al

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All Forums Category: General Philatelic Discussions (Non Country Specific) Forum: Philatelic Book, Reference, Supply and Software
 
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