I was alloying some soft lead with type metal (letters) I've had for a long time. As I'm impatient, I use a small propane torch to supliment the 4000 watts of heat from the bottom of the pot. Some of the type metal melted as I would expect, and some of it "boiled" and popped. The result was a foamy layer on top of the melt which I quickly removed. I then grabbed a few letters and melted them. One bubbled and spit as a few in the pot had. The image below is the solidified bubbles.
Has anyone ever heard of zinc based type metal??? If no, has anyone ever seen this behavior in "good" metal?
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