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Dissolve Copper sulphate in water. Keep adding it until the solution is saturated (no more dissolves). Decant the clear, saturated solution into a clean beaker.

Now tie a thread around a small copper suphate crystal. Wrap the thread around a lolly stick. Dangle the crystal in the saturated solution and leave it all on a window ledge.

As the water slowly evaporates, copper sulphate solid will be deposited on the best surface it can find. This will be the dangling crystal, and it will grow.

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15y ago

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