How to Extract Gold from a Circuit Board | Earth Science

You can make gold appear from something that isn't gold... And this is chemistry, not alchemy!
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Bang Goes The Theory Series 5
With family-relevant stories, spectacular stunts and competitive team challenges, the series is hosted by a gang of presenters who are passionate about science and happy to share their knowledge, banter and experiments.
Welcome to BBC Earth Science! Here we answer all your curious questions about science in the world around you. If there’s a question that we haven’t yet answered let us know in the comments on any of our videos and it could be answered by our Earth Science experts.