Distilling at too low a temperature will leave behind byproducts (especially methanol) that are pretty bad for you.
Back in the day, it was somewhat common to use freeze distillation, where you leave a lower-alcohol product like cider out in the cold for several weeks, removing the ice each day. This drives up the alcohol concentration by removing water, but it leaves *all* these nasty byproducts behind in very high concentrations.
Latest Answers