Yes, so I’m on lunch break >.<
Who knows what a US copper penny is made of? Well….it used to be copper. Now, its a copper shell with a zinc interior. You can get the copper shell very easily, provided you want to play with some acid. Get a penny and make sure its dated post-1982.
File around the edge to the point where you can see a bit of white (zinc)
Get muriatic acide from your nice, friendly, local hardware store. Its also known as HCL, its used for cleaning concrete.
Drop the penny in a glass bowl of the acide, make sure it doesnt splash, and wear gloves….please. After the bubbles stop forming, pour the acide into a sink, and make sure it doesnt splatter. NEVER add water TO a chemical directly, it can boil. always add chemical TO water.
Rinse the penny shells afterwards, and voila!

Thank you popsci.com 😀