Toward the end of the run, the vapor temperature begins to rise slightly, and tails begin to appear in the product. Your nose is a better detector of tails than the thermometer, though, and toward the end of the run it is best to start collecting into a bottle and check for the presence of tails every ten minutes or so. If there are no tails, add the contents of the jar to the bulk container each time you check. Once tails appear, collect into a separate container until the temperature begins to rise rapidly, signaling the end of the run. If you desire some of their flavor, you can add small amounts of the heads and tails back to your batch, and the rest can be added to the boiler with the next batch, to recover the ethanol they contain.
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