Corn whisky is defined by the USA's code of federal regulations title 27, volume 1 to be:
Corn whiskey is whiskey produced at not exceeding 160 deg. proof from a fermented mash of not less than 80 percent corn grain, and if stored in oak containers stored at not more than 125 deg. proof in used or uncharred new oak containers and not subjected in any manner to treatment with charred wood; and also includes mixtures of such whisky.
Corn whiskey is an American whiskey made from a mash made up of at least 80 per cent maize, or corn. The whiskey is distilled to not more than 80 per cent alcohol by volume, and aged in used or untreated oak barrels for a short time, primarially to pick up color.
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