Denatured Alcohol
The other day I cleaned a large surface with denatured alcohol and wore a blue nitrile glove on the hand holding the soaked rag. The next day I had a small spot to clean and didn’t bother with a glove since small amounts of skin contact with alcohol are not harmful; we often use isopropyl alcohol to clean skin. This led to musing on the concept of denatured alcohol. Denatured alcohol is 90% ethanol, an alcohol so mild to the body that people drink it. Drinking ethanol, while not acutely toxic, is still a problematic thing, so its distribution is controlled by law and heavily taxed. Ethanol is so useful for other things though, like fueling cars or cleaning, that it is worthwhile to have a way to distribute it in a form unsuitable for beverage consumption. So it is “denatured,” rendered unfit for drinking by mixing into it poisonous substances, traditionally methanol. Because ethanol is harmful to individuals and society, we make it safe to use freely by rendering it too toxic to ingest.