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is that a smaller amount of liquid is placed in an open smaller vessel inside a larger one that is closed. A cheap 100 W immersion heater is typically used as heat source, but a thermal immersion circulator, like a sous vide stick is ideal because it comes with a temperature controller. The liquid is kept heated at about 50 C and slowly evaporates the ethanol to 40% ABV that condense on the inner walls of the outer vessel. The condensation that accumulates

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