100% ethanol is "hygroscopic," meaning it will quickly pull moisture from the air and dilute itself down to 95% if not stored in a strictly airtight container.
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Finding (often called "absolute" or "anhydrous" ethanol) depends heavily on whether you need it for industrial, medical, or lab research purposes. Because it is highly pure and potentially drinkable, it is often strictly regulated or taxed. 1. Where to Buy 100% Ethanol 100% ethanol is "hygroscopic," meaning it will quickly
If you have 100% ethanol and need to dilute it for sanitizing purposes (standard is 70%): 100% ethanol is "hygroscopic