“Just found a stash of several bottles of old (exp: 2017) 91% isopropyl alcohol.
Should I toss them?”
NOOOOO!!!
The only thing that happens is that some of the alcohol evaporates. At only 3 years past the date, it is still probably 89%! I did have some old hand sanitizer from 2011. I added some 99% alcohol to bring the strength up in case the alcohol had evaporated. I would research more on the net about it.
Same goes for canned food too. It may not look or taste the best, but most stuff is still good to eat and have the nutrients.
That’s what seems to be the consensus....that it just deteriorates in strength, a bit.
Agree about the canned goods. Have known that one, for years.
Some meds, too.
Just wasn’t sure about the alcohol, since hydrogen peroxide DOES degrade, usually close to expiration date.
(No more fizz :)