What can i do with zinc metal 99.99% pure ?

Return back to the uni lab you stole it from.

Alternatively, file it into dust with a fine file, mix it into cooking oil to make sunscreen lotion. When your done, use it cook bacon for that important micronitrient.

>>9172715
Might as well ask here, whats a safe way to keep/dispose of dirty mercury? I put it in a little vial cause I moronically wanted an "element collection" but now that I graduated I realize I don't want all this shit here. I also have iodine crystals. Ye yea i know it was stupid, and I'm not looking to contaminate the environment.

add stuff to it so it's less pure

>>9172697
Make it 100% and collect your Nobel Prize.

>>9173099
encase it in concrete and bury it.

>>9173099
call your local sanitation dept