>>>  b)  Better yet, formic acid is "Generally Recognized As Safe"
("GRAS") in foods by the US FDA. c)  Formic acid is said to occur
naturally in honey at levels up to 138 parts per million, and is also
found in vinegar, wines,  beer, cheese < < <

What do you know about oxalic acid in this regard?  From what I have
been reading, oxalic is as effective, or more effective than formic, and
easier to apply consistently in some circumstances.

I have some oxalic and formic resource links at
http://www.honeybeeworld.com/formic/default.htm (and am always looking
for more good links to add there).

allen
http://www.honeybeeworld.com

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