Oxali Acid is "wood bleach."  We use it all of the time in our shop, but
can be purchased cheaply at any store that sell products for cleaning wood;
decks,etc.  You have to be carefull when purchasing it as a "deck
brightener," as it may not be pure.  We buy it in 5# canisters, but I just
saw it at a local hardware store packed in a 1# tub by "DAP<" it is labeled
simple "Wood Bleach."  Hope this helps...BTW< made my own evaporator, and
will try it tonight...JK

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