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@cozykaffe@snouts.online You'd be surprised at the kinds of things that are in high school chemistry supply closets.
We worked as a TA for a chemistry lab in high school, and the supply closet had an entire wall of shelves covered with danger symbols and warnings about explosive substances, highly toxic substances, strong oxidizers, and more.
I seem to recall that there was also one mystery bottle that turned out to be literally illegal to have in a school, but it was okay because it had been sitting in the closet since before it was made illegal.
@cozykaffe@snouts.online That said, there are much worse things in such a closet than mercury. There are worse things used in educational chemistry labs every day!
Did you know that if you're ever working with fuming nitric acid, it's generally better to not wear gloves? fuming nitric acid will ignite most things gloves are made out of on contact.