SD Alcohol 38-B is mostly ethanol, but certainly not ethanol derived from grapes or dates. Rather, it is probably derived from the much cheaper corn. "SD" stands for "specially denatured." Denaturing happens to alcohol to make it unfit to drink, often by adding methanol, which is poisonous. SD alcohols have little or no methanol, making them not a health hazard, but they generally contain bitterants to make them unpleasant to drink. another example of an SD Alcohol 38-B is Listerine, which is extremely unpleasant to drink, but not poisonous.
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