Copper powder from aqueous copper sulfate solution help

I’ve been wanting to make copper powder for some homemade pyrotechnics. When placing an iron object in a copper sulfate solution, copper powder is produced. However, sooner or later, the reaction slows down and the solution begins to turn a teal color instead of its previous blue color. From what I’ve learned, the teal color is from iron sulfate. Therefore, the copper sulfate eventually gets used up.


I know another way to produce copper powder. Place two COPPER electrodes in the copper sulfate solution and the anode dissolves while copper powder builds up on the cathode. My question is, do I need to replace the copper sulfate solution if I do it this way? It seems I would not have to because the copper ions are being replaced by the dissolving anode.


