The addition of #Methanol, which is #Poisonous, renders #DenaturedAlcohol unfit for consumption, as ingesting denatured alcohol may result in serious injury or death. Thus denatured alcohol is not subject to the taxes usually levied on the production and sale of alcoholic beverages. See: #Aniline

For example, the #Bitterant #Denatonium might be added to food used in a laboratory, where such food is not intended for human consumption. A poisonous substance may be added as an even more powerful #Deterrent. For example, #Methanol is blended with #Ethanol to produce #DenaturedAlcohol.