What is Ethanol
Denatured ethanol has a small % of denaturing agent added to make the ethanol undrinkable (Bittrex). Aside from the denaturing agent, denatured ethanol is the same as normal ethanol. The denaturants are added to ensure that the ethanol cannot be consumed as a spirit. In this regard, denatured ethanol is very similar to methylated spirits.
Methylated spirit is ethanol mixed with methanol. It may have small amounts of other chemicals added, as well as a distinctive purple dye. Mixing ethanol and methanol gives meths a strong, unpleasant smell. Methanol is very toxic when consumed when absorbed through the skin or inhaled in high concentrations.