methyl hydrate (aka methanol), isopropyl, etc,, is what is used to denature ethanol.
they are what is put in rubbing alcohol, etc,, that makes it poisonous to drink.
there may be other adulterants as you say,, but it is the methanol and or isopropyl and or acetone that are added to ethanol that make it poisonous or blinding or whatever,,
you seem to be saying that using denatured alcohol is bad, yet using the stuff that is used to denature it is the next best thing you can get besides reagent grade ethanol,,??
I agree drinking any of this stuff except maybe pure ethyl alcohol (in moderation,,
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is extremely toxic,, but when using as a solvent,, im pretty sure (im no chemist like you) all toxic residuals must be fully evaporated,(isopropyl), why else is it harmless for skin contact,, as we all know our skin is an organ quite capable of absorption like any other organ. Although i wouldn't recommend bathing in the stuff,,
but the toxicity comes when ingested,, as the liver metabolizes isopropyl into acetone, or methanol into formaldehyde. It would take alot of absorption through the skin to accomplish this,, never mind the microscopic residuals left behind after evaporation,, if any.
But i guess in the end,, if you feel that using denatured alcohol is bad for making oil,, so be it,, don't use it,, but coming here and telling anyone else that uses it, that it will ruin there oil and there health, without any evidence to support it, besides saying your a chemist. And then to say that methyl hydrate (methanol) is purer product than denatured alcohol??? i dunno man,, denatured alcohol (although many different distillations) around here is mainly ethanol with 10% methanol (methyl hydrate)!!!!
I do however agree if you have access to reagent grade ethanol or even everclear, then that would be a better choice,, but for those of us that don't or don't wanna spend a fortune, for gallons of the stuff,, using denatured alcohol is perfectly fine if fully evaporated and purged correctly.