Where can i get powder copper, zinc, calcium, and potassium?

I am doing a flame test in school, and by the end of march break we have to have finished the experiment


We just need to get the powder metals somewhere, and i have no clue where to get them!


please and thankyouuWhere can i get powder copper, zinc, calcium, and potassium?
This is the best US suplier of small quantities of chemicals.


http://www.unitednuclear.com/ ------United nuclear Inc.





I recomend you use chlorides because they produce better colors!!Where can i get powder copper, zinc, calcium, and potassium?
Ummm, your chemistry teacher?


You will not get pure potassium metal. Anywhere. (If you do let me know :)
GNC, vitamin store
My sister got these from someone off of ebay...try that!
Alfa Aesar (www.alfa.com) has most elements in pure form in various states (powder, nanopowder, wire, ribbon, flake...)