BTW, I do something similar for flash formic acid treatment, just soaking a couple of folded paper towels and placing them in the tray under the SBB.  Really easy and no need to open the hive.

I suspect strongly that will be a failure.  First,  knowing the dosage and flash time is important for formic,  and second the vapors are heavier than air and I would suspect they will not rise enough to be effective.  Bees may move some of the vapors around,  but My guess is they will move them down and out instead of up and in.


Charles

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