[ ref. http://www.mmdigest.com/archives/Digests/199911/1999.11.26.04.html 

I have looked all over the Internet to find a bookbinder product for
packets of dry acid deactifying recommended here to rejuvenate brittle
piano rolls.  The author here described the procedure of putting 20
or so brittle piano rolls in a plastic gallon trash bag with about
four packets of dry acid remover and sealing the bag.  The problem is
I cannot find these packets anywhere and wonder where they might be
bought.  They seem to only have liquid sprays.

Jack Thalman