Thanks Phil and Member for the kind words.
DRobbins if enough Oxalic acid entered the bees blood stream the pH of the blood would immediately drop, become acidic and kill the bee. Blood is very sensitive to pH change, that is, a drop in tenths is lethal example from 7.5 down to 7.2 would be disastrous.
So Oxalic acid on the outside of a bee is working on eliminating Varroa. Quantitating the amount of Oxalic acid per bee would bee impossible. The queen eats constantly to keep up laying and a queen could easily be rationed 10X what a worker would consume of Oxalic acid. So again quantization would be impossible to predict per each bee.
Good thought, nice try, but keep at it and come up with another idea. We know lithium chlorine in a bee diet mixed with sugar syrup or water kills Varroa, 4mM is deadly to the mites. This is being studied this day.
Van