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Moonshine, white lightning, mountain dew, hooch, and Tennessee white whiskey are terms used to describe high-proof distilled spirits, generally produced illicitly. Moonshine is typically made with corn mash as the main ingredient.  The word "moonshine" is believed to derive from the term "moonrakers" used for early English smugglers and the clandestine (i.e., by the light of the moon) nature of the operations of illegal Appalachian distillers who produced and distributed whiskey. The distillation was done at night to avoid discovery.
Poorly produced moonshine can be contaminated, mainly from materials used in construction of the still. Stills employing used automotive radiators as condensers are particularly dangerous; in some cases, glycol, products from antifreeze, can appear as well. Radiators used as condensers also may contain lead at the connections to the plumbing. Both glycol and lead are poisonous and potentially deadly.
Although methanol is not produced in toxic amounts by fermentation of sugars from grain starches, contamination is still possible by unscrupulous distillers using cheap methanol to increase the apparent strength of the product. Moonshine can be made both more palatable and less damaging by discarding the "foreshot"—the first few ounces of alcohol that drip from the condenser. The foreshot contains most of the methanol, if any, from the mash because methanol vaporizes at a lower temperature than ethanol. The foreshot also typically contains small amounts of other undesirable compounds such as acetone and various aldehydes.
Alcohol concentrations above about 50% alcohol by volume (101 proof) are flammable and therefore dangerous to handle. This is especially true during the distilling process when vaporized alcohol may accumulate in the air to dangerous concentrations if adequate ventilation has not been provided.
A quick estimate of the alcoholic strength, or proof, of the distillate (the ratio of alcohol to water) is often achieved by shaking a clear container of the distillate. Large bubbles with a short duration indicate a higher alcohol content, while smaller bubbles that disappear more slowly indicate lower alcohol content.
A common folk test for the quality of moonshine was to pour a small quantity of it into a spoon and set it on fire. The theory was that a safe distillate burns with a blue flame, but a tainted distillate burns with a yellow flame. Practitioners of this simple test also held that if a radiator coil had been used as a condenser, then there would be lead in the distillate, which would give a reddish flame. This led to the mnemonic, "Lead burns red and makes you dead." or "Red means dead." Although the flame test will show the presence of lead and fusel oils, it will not reveal the presence of methanol (also poisonous), which burns with an invisible flame.
Varieties of moonshine are produced throughout the world.