I melted some roof flashing. I noticed the melt had a multicolored skin on top. when it cooled in the muffin pan it shrunk significantly and got a galvanized look to it.
The ingots came out very shiny.
The one on the left is ww. The one on the right is the roof flashing. I used a spring loaded punch to test hardness. The roof flashing seems softer.
What is this substance? Can I cast it?