Denatured Alcohol is the name given to alcohol that has been contaminated with poisonous constituents like methanol etc. This is done to prevent misuse of alcohol (by drinking) that has been arranged for other commercial purposes.
Often, denatured alcohol is coloured blue, so that it can be easily identified. 

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Denatured alcohol, also called methylated spirits, is ethanol that has additives to make it poisonous, somewhat bad tasting, foul smelling or nauseating, to discourage recreational consumption. In some cases it is also dyed.
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