Moonshine, white lightning, mountain dew, hooch, homebrew, and white whiskey are terms used to describe high-proof distilled spirits that are generally produced illicitly. Moonshine is typically made with corn mash as the main ingredient. Liquor-control laws in the United States that prohibit moonshining, once consisting of a total ban under the 18th Amendment to the United States Constitution, now center primarily on evasion of revenue taxation on spiritous and/or intoxicating liquors, and are enforced by the Bureau of Alcohol, Tobacco, Firearms and Explosives of the United States Department of the Treasury; such enforcers of these laws are known by the often derisive nickname of "revenooers".
The word "moonshine" is believed to be derived from the term "moonrakers" used for early English smugglers and the clandestine nature of the operations of illegal Appalachian distillers who produced and distributed whiskey. The distillation was done at night to avoid discovery.
Moonshine was especially important to the Appalachian area. This white whiskey most likely entered the Appalachian region in the late 18th century to early 1800s. Scots-Irish immigrants from the Ulster region of Northern Ireland brought their recipe for their uisce beatha, Gaelic for "water of life". The settlers made their whiskey without aging it, and this is the same recipe that became traditional in the Appalachian area.
In the early 20th century, moonshine became a key source of income for many Appalachian residents, since the limited road network made it difficult and expensive to transport corn crops. As a study of farmers in Cocke County, Tennessee, observes: "One could transport much more value in corn if it was first converted to whiskey. One horse could haul ten times more value on its back in whiskey than in corn."  Moonshiners in Harlan County, Kentucky, like Maggie Bailey, made the whiskey to sell in order to provide for their families. Others, like Amos Owens, from Rutherford County, North Carolina, sold moonshine to nearby areas.
In modern usage, the term "moonshine" ordinarily implies that the liquor is produced illegally; however, the term has also been used on the labels of some legal products as a way of marketing them as providing a similar drinking experience as found with illegal liquor.
Poorly produced moonshine can be contaminated, mainly from materials used in the construction of the still. Stills employing 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. These methods often resulted in blindness or lead poisoning for those consuming tainted liquor. This was an issue during Prohibition when many died from ingesting unhealthy substances.
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.
A more reliable method of testing is to use scientific testing equipment, such as an alcoholmeter or hydrometer. A hydrometer is used during and after the fermentation process to determine the potential alcohol percent of the moonshine, whereas an alcoholmeter is used after the product has been distilled to determine the volume percent or proof.
Varieties of moonshine are produced throughout the world.
- Desi liquor
- Bathtub gin
- Bootleggers and Baptists
- Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF)
- Congener (alcohol)
- Copperhead Road
- Corn whiskey
- Dixie Mafia
- Lawless (Film)
- Moonshine in popular culture
- Moonshiners (TV series)
- Nip joint
- Sour mash
- Thunder Road (film)
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- Watman, Max. Chasing the White Dog: An Amateur Outlaw's Adventures in Moonshine (2010) ISBN 9781439170243
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- "Moonshine – Blue Ridge Style" An Exhibition Produced by the Blue Ridge Institute and the Museum of Ferrum College
- Déantús an Phoitín (Poteen Making), by Mac Dara Ó Curraidhín (a one-hour 1998 Irish documentary film on the origins of the craft).
- North Carolina Moonshine – Historical information, images, music, and film excerpts
- Moonshine news page – Alcohol and Drugs History Society
- Georgia Moonshine – History and folk traditions in Georgia, USA
- "Moonshine 'tempts new generation'" – BBC on distilling illegal liquor in the 21st century.
- Moonshine Franklin Co Virginia Moonshine Still from the past – Video
- Dangers of Drinking Homemade Moonshine Video about the dangers of drinking moonshine