fr4nk on Nostr: Modern pennies are 95% zinc, with a thin layer of copper on the surface. Zinc melts ...
Modern pennies are 95% zinc, with a thin layer of copper on the surface. Zinc melts at 420C, and the copper layer will generally burn away when you melt that, leaving oxide behind.
Published at
2024-09-07 02:52:10Event JSON
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