So, I have a vaporizer and temps in the right range today and tomorrow) but when I went to my hardware store to purchase some wood bleach/OA all they had was the Savogran Product (10501) which doesn't clearly say what's in it except that it "contains" oxalic acid".
No info on the package itself as to what concentration which is a critical thing for pesticide dose calibration but more worrying is what else may be in it that I would applying to my bees by vaporization. The MSDS data for this product says the contration is "95-100% oxalic acid dihydrate. No info about anything else.
Online I see that similarly labeled and coded packages of Savogran Wood Bleach are sometimes labeled "Concentrated Formula", but mine only says "contains oxalic acid", though all other details match, including the product code.
On Amazon I can purchase Oxalic acid in bulk. I suppose if I go to the Chemistry Store I can also puchase in it the pure form and in bulk (maybe not, I haven't checked yet.)
So, what to do? What are other people doing successfully using for OA in a vaporizer? Information from European sources is (naturally since it's approved for bees there) specifying oxalic acid dihydrate, (but not any data about strength). I am a bit uneasy about simply assuming that wood bleach is at similar strength and free from any additional carrier or inert materials I don't know about.