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The point of distillation (of alcohol) is to separate the ethanol from the other undesired components. The distillation process takes advantage of the different volatilities. In the fermented MASH are undesired substances more volatile than ethanol (e.g. methanol) which will distill out first. This is the Heads and is discarded. Once these more volatile compounds are eliminated you have the Heart of the run which is the quality product. Finally if you keep distilling you begin getting some undesirable lower volatility substances, oils and water, the Tails, which is also discarded by stopping the distillation run. The art of the experienced distiller is to know when to draw the lines between Head, Heart, and Tail. The more selective one is, the higher quality (but less quantity) of the produced distillate.

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Q: What is head heart and tail in distillation?
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