By now we have all heard about the life time tests for the Corona virus. Paper/cardboard a few hours, copper 30 minutes, plastic 1 day, stainless steel 3 days, and smooth surfaces 1-3 days. You can quibble on the precise time lines and/or the terminology of killing the thing. Bottom line, the goal is to stop its efficacy i.e., its ability to do harm. The World Health Organization (WHO) published 2 formulas. One with Ethanol and the other with Isopropyl. The WHO’s intent was an effective sanitizer, easy to mix, cheap, and with materials available in all countries. Ethanol and Isopropyl were chosen because all countries can get one or the other. The WHO formula (google it) will “kill” the virus within 30 seconds! That is why there is water added to it so the drying time (evaporation) is delayed a bit. Before you fire up your still just try to buy yeast anywhere today. Almost impossible!
PS: Percentages greater than 80% alcohol were found to be less effective than 65%-75% and the percentages are slightly different for the 2 alcohols. My numbers are recall only with no guarantee of accuracy. Do your own fact-checking.

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