no you cant use it.... Denatured alcohol, also known as methylated spirits, metho, or meths in Australia, Ireland, New Zealand, South Africa, and the United Kingdom; and denatured rectified spirit is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage its recreational consumption. Edit: The denaturants can include methanol, benzene, pyridine, castor oil, gasoline, isopropyl alcohol, and acetone

Probably not, like Northofthenexus says. But look at the ingredients or search for the sds/msds for the exact brand/product (all contents should be listed in section 3) and depending on what's in it and what you're using it for it *might* be okay. Like if you're trying to recrystallize from it, and the only denaturant is isopropyl alcohol at like 5%, you can probably get away with it. IPA isn't that toxic (relatively I mean), and as long as you dry your recrystallized product well enough I think that would be fine. Be aware that the additives themselves might fuck with its use as a solvent; (for example, if your desired compound is somewhat/poorly soluble in ethanol -making it a good recrystallization solvent- but very soluble in isopropyl alcohol, well now that's gonna cause headaches for you). I wouldn't consider using anything with a bitterant like dinatonium benzoate, or a very high-boiling solvent like castor oil. Fuck pyridine- hard veto. Benzene is notoriously carcinogenic, but if its dried well (and you're not breathing the vapors while its drying) you could get away with it. Methanol is toxic & causes blindness, but similar to benzene as long as its dried well enough it'll be okay (and methanol is a very good solvent in its own right). Of course, the safest bet is to just get good ol' non-denatured ethanol (everclear). The *only* disadvantage I can think of is cost- which, uh, is minuscule and worth it compared to your health.