denatured alcohol

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alcohol, denatured Drinkable alcohol is subject to tax in most countries and for industrial use it is denatured to render it unfit for consumption, by the addition of 5% methyl alcohol (methanol, CH3OH, also known as wood alcohol), which is poisonous. This is industrial rectified spirit. For domestic use a purple dye and pyridine (which has an unpleasant odour) are also added; this is methylated spirit.

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denatured alcohol The addition of dyestuffs and unpleasant flavours (such as pyridine) to prevent the consumption of alcohol which is intended for domestic or industrial purposes; up to 5% (toxic) methyl alcohol is added.