Has anyone ever gotten strange colors while smelting WW. After it melted it started to get a blue/green/purple, almost swirly psychadellic lol. It even showed up as small blue streaks in the 4 ingots I poured and the tiny amount left over in the pot, i dont know if zinc does that or something else made its way in but ive been through a hundred buckets of WW and never seen this. I dont think its a heat issue but I dont know. Any thoughts