So what causes silver to stick to glass on the back of a mirror?
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It’s actually made there. Mirrors are made using a chemical solution that contains dissolved silver (or sometimes other metals), and then they perform a chemical reaction which causes the silver metal to come out of solution. When it does, a thin film of it will stick to any surface it can find.
[Here’s a video of the whole process done in a small lab setup](https://youtu.be/hUX_cpFWNso). It’s not a process you should try yourself at home -the video goes into the problems with doing that- but it shows the basics of how it all works.
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