I think that there is some misreading of the EPA Final Rule applied to Oxalic Acid

The final rule does not require "OA certified for purity" at any level, nor does it require "reagent grade".

This is a wonderful gift to the beekeeping community, as it simply says "Oxalic Acid".

How pure does it need to be?  The final rule does not say, so this is left to the sole reasonable judgment of the beekeeper, as it is his bees and his lungs at risk.

It seems clear that the EPA recognizes that most all Oxalic Acid crystals will be very pure, as impurities would result in "dirty" crystals, and be visually "different", and unacceptable for even wood bleach.
So, claims of 95%, 97%, 99.6% whatever are immaterial, and very likely marketing puffery rather than test data.

Bottom line, you can't buy Oxalic Acid with enough impurities to make any difference, and the EPA recognized that by using the generic chemical name.


Beekeeper:  "The Label is the Law!"
Fischer: "The Law is the Law!"
Judge Dredd:  "I AM the Law!"
Judge Dreadlocks:  Judge George Powell, Texas 351st District Judge

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