How to Make a Purple Penny! (The Gold Penny Experiment - A Safer Method)

The gold penny experiment takes an ordinary copper penny and turns it "silver" and "gold" 😲💰 But it uses a few dangerous chemicals, which can make it unsafe for kids... 😬
Luckily, there's a safer way to do this experiment at home! Just put the penny on a hotplate and heat it up 👌 How does it work? It's all due to thin-film interference!
I first saw this experiment in a paper by Thomas Kuntzleman and Levi Hogan: pubs.acs.org/doi/abs/10.1021/...
Make sure you also check out Thomas' CZcams channel! ‪@TommyTechnetium‬
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