I've seen the gallium melting point trick done MANY times.

It is safe if done inside of a thin-walled glass container, fwiw-- because there is no direct skin contact.

I've used it that way in Gen Chem as a 'pass-around' in an ampoule while I demo'ed something else at the front of the room with a burner, etc.

Does that help?

I wouldn't use it unsealed. No real reason to, if you think about it-- the real point is the melting point, and you can do that with it sealed inside glass.

Schrödinger's cat walks into a bar. And doesn't.