I don't think the caffeine has anything to do with the tannin.
I heard that caffeine was the acidic part of coffee or tea, as tannin is
with walnut husks. So the suggestion was to use caffeine-free, which would
be acid-free, and the better thing archivally. But I only know that I
heard this, not that it was necessarily true. I wonder if anyone else has
heard the same suggestion.
CarolynKayta Barrows
dollmaker, fibre artist, textillian
www.FunStuft.com
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