Originally Posted by
HillRider
The azeotrope is 87.7% IPA/13.3% water W/W and 91% IPA/9% water V/V so the drugstore bottles labeled 90% are that composition.
Note to fietsbob: There is no "200 proof White Lightning". The most concentrated drinkable ethanol is 95% Ethanol or 190 proof which is the azeotrope. Getting to 200 proof (100% ethanol) requires a ternary distillation or chemical drying, both of which make the resulting alcohol unfit to drink even if diluted below a dangerous concentration. For that matter, 190 proof Ethanol cannot be drunk as is.
Bull****. I drank 190 proof ethanol all the time my freshman year of college.
The real problem with 200 proof ethanol is keeping it that way -- it's so hygroscopic that it will pull in whatever moisture it can when exposed to the air.