Oxalic acid dihydrate evaporation method, Varroa struggle doing.
This application, the design of my own making apparatus.
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I did find the list of applications.
2 g of oxalic acid dihydrate put into the apparatus.
30 seconds after the beginning of evaporation.
1Koloni 1 minute it ends.
Entries do not need to shut down, because it will not come out of the bee is uncomfortable.