[foobar1962]

Such toxins are added to make the alcohol unsuitable for human consumption, and thus avoid paying government alcohol tax or duty.

Where I am it's called "methylated spirits" and IIRC the boing point of the additive is very close to that of the alcohol so it's not possible to distill it out.

[mcv]

20 years ago I read about a Dutch company that sold pure alcohol for consumption to Russia, where people would drink one sip of pure alcohol followed by two sips of orange juice.

Hopefully the only country with a market for that.