James and All ,
Very good post Jim.
You understand the dealing with any acids.
The 80% part has more to do with it in a liquid state than anything else.
62F can be a problem in any Northern states like me in Washington.
If you have frame rest , just remove them and put in new ones when your done.
Jim has addressed the problem with dealing with all acids. It should be taught in HS Chemistry classes.
I have not had my box's analyzed to make sure everything is dead. But my knowledge of chemistry and knowing that two weeks is a long time to have the vapor present , chances are that the box's are clean of Nosema.
The Best
Roy
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