The metal salt A is blue in colour. When...

The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B,C and D?

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A is copper sulphate pentahydrate, `CuSO_(4).5H_(2)O,` B is water, `H_(2)O`, C is anhydrous copper sulphate, `CuSO_(4)`, D is water, `H_(2)O`

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