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/d...
Make sure you also check out Thomas' RUclips channel! ‪@TommyTechnetium‬
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If you do choose to do these activities, you agree to do so at your own risk (please refer to this page www.sillyscien....