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There was a time when film developing chemistry used a formulin fix hardener so the emulsion could take some handling without damage. That meant manipulating glass jugs of formaldehyde.

I was in a pro lob once when someone dropped and broke a jar of it.
We opened all the doors and vacated the lab. But formaldehyde has a habit of hanging around in areas not fully ventilated. Hours after the lab was aired out, you could walk down a hall, turn a corner, and oh, momma. My sinuses were roadkill.

"I handled a white sodium hydroxide tablet without gloves "

that must have been fun ... ouch ... well, I once created acetelyne gas without venting the tube right off ... the T.A. kinda freaked out ... hehe ... we made aspirin that semester but since it wasn't buffered, none of us had the guts (pun intended) to take any ...

did a similar thing with the benzene ... all freaked out (without gloves) I concentrated on not spilling it and got it RIGHT on my thumbnail ... I still freaked ... for no reason probably since it was the thumbnail ...

I enjoyed making nylon pulling it from the interface in the beaker ... that was kinda cool ... somebody in another section broke some thermometers and we had a mercury spill so they had to call in the guys in biohazard suits ... the lab was shut down for two weeks ... we all enjoyed the "break" provided by some unknown fellow classman ...