I don't know why, but instead of plating the key with copper, a lot of small pieces of copper were stuck to the key, but came off when I took the key out of the solution. If you know why, please post the answer in the comments.

You can buy Cupric(II) Sulphate at :

www.hometrainingtools.com/copper-ii-cupric-sulfate-30-g/p/CH-CUSO4/

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