u/Interinternet

Image 1 — Got this flask (?) secondhand, seemingly once used in lab. Rinsed it, got distracted and put it on table. Weird reaction with table and left permanent ring. Was there chemical residue on the glass?

Image 2 — Got this flask (?) secondhand, seemingly once used in lab. Rinsed it, got distracted and put it on table. Weird reaction with table and left permanent ring. Was there chemical residue on the glass?

Got this flask (?) secondhand, seemingly once used in lab. Rinsed it, got distracted and put it on table. Weird reaction with table and left permanent ring. Was there chemical residue on the glass?

Actually quite a lot of lab equipment in the thrift stores as a lab nearby closed. I’ve gotten a few pieces as they are good for kids potion making and even one huge glass evaporator for a vase. Now wondering how to properly deal with all of them.

u/Interinternet — 12 days ago