This is a picture of a Diana Tree — a formation of crystalized silver made from a reaction between mercury and silver nitrate. You can do something very similar with gold, according to a story in Smithsonian magazine about the real chemistry done by the alchemists of 17th century Europe. They couldn't magically create gold, but that doesn't mean the reactions they were producing were just made up. It's a great look at the origins of modern chemistry.
Image: ΛΦΠ via CC
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