"Winter one has about 40% propanol alcohol."
Might be true in Canada. US stuff has about 30 to 40% methanol depending on temp rating. The lower the temp rating the higher the methanol. I find mites sink like rocks in the stuff I use rated for neg 30 deg F. Density is about 0.92 versus 0.88 for 50% isopropanol or 0.79 for 95% ethanol. The blue does not bother me as I pour most of it off and reuse for the next batch of bees before I count. I have rewashed lots of batches of bees and very seldom get any additional mites.
Dick
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