CHAT: acid paper

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.

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