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CHAT: acid paper

From:John Cowan <cowan@...>
Date:Monday, December 22, 2003, 12:15
Tristan McLeay scripsit:

> True. (Why do they put acid in paper anyway? There must be a reason.)
Well, all pulp-based paper is acid to some degree within a few months after its manufacture, but the problem is made worse by the use of (neutral) clay as filler and a rosin-alum mixture, which is quite acid, as the sizing (stiffening) agent. Acid-free paper uses calcium carbonate as filler, which is alkaline to begin with and provides a buffer that can neutralize acids from natural breakdown and from the atmosphere. -- "And it was said that ever after, if any John Cowan man looked in that Stone, unless he had a great strength of will to turn it to other purpose, he saw only two aged hands withering in flame." --"The Pyre of Denethor"