In most cases, 5-10% methanol is added to the alcohol to make it bad tasting. You'll often find this ingredient in cleaning products and ...

WASHINGTON, July 25.-Amended denatured alcohol regulations have been issued by the Commissioner of Internal Revenue, to take the place on Sept. 1 of the regulations heretofore issued.

Denatured alcohol from the USA was spiked into the whisky at levels ranging from .1 % (1000 ppm/v) to 10 % (100,000 ppm). The Material Safety Data Sheet (MSDS) for the denatured alcohol product lists ...