478
compruleter
(lemmy.ml)
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Hitting 99% is as impressive as it is impossible making wine :D
Distillation x3 or more does that, or just x1 with a really good still (a reflux still for example) and competent user.
Thar would be a surprise, as it forms an azeotrope at around 96%.
It seems you're correct, my apologies, alcohol goes through a drying process to reach higher purities.