………..I do know that 99.9 ethanol absorbs water until azeotropic but it is not clear if it continues to do that.
Taking that “until” literally would appear to suggest that absorption stops at 96% by volume - but that looks high to me. I’ve used ethanol to dry hydrogen gas but perhaps it wasn’t doing much after a while.
I’ve also mixed my meths with water to eke it out before now; probably more than 10%. It doesn’t splutter in a Trangia it burns OK - plenty hot enough to boil water and make a stew.
I’ve got an old quarter bottle of meths that started out purple and it’s now yellow but I’ve no idea whether that is sunlight, water or something in the plastic bottle that’s caused that.
Even though my experience says diluting meths is fine I checked on line to make sure which end of my alimentary canal I’m talking through.
I found an old an old BcUK thread by
@FlashPan (6th Feb 2017) on the subject.
Let’s see if I or someone can find it.