Quote:
Originally Posted by HairyChick
Recipes that call for vodka or spirits should be avoided entirely, because you need a high proof liquor to get the right concentration of alcohol by volume. That's because most liquor is mixed with water, so if you mix a 80-proof vodka (which is the standard proof) with aloe, you'll have hand sanitizer that contains roughly only 40% alcohol.
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Grain alcohol is usually around 180 proof or 90% alcohol. If you can't get it and only have access to vodka, put it in the freezer. The water will freeze before the alcohol. Voila, higher concentration of alcohol.