Neutral grain spirit
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Neutral grain spirits (a.k.a. pure grain alcohol or grain neutral spirits) or corn liquor refers to a clear liquid distilled at a high ethyl alcohol content. The term neutral refers to the substance's neutral odor. The grain from which it is derived can be any of the common cereal grains, though corn may be most common. Many distilled spirits (such as whisky) are distilled at lower alcohol percentages to preserve the flavor of the mash. Essentially, the mash medium used to make neutral grain spirits is irrelevant to the character of the final product.
Everclear is one brand of neutral grain spirits sold in the United States. It is almost pure ethanol (95 percent). It is often used to mix into other beverages because drinking undiluted neutral grain spirits in shots can be harmful over a period of time. Additionally, a great deal of moonshine is made of corn, and is thus corn liquor.