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Crystals of a substance changed their co...

Crystals of a substance changed their colour on heating in a closed vessel but regained after sometime, when they were allowed to cool down.
(i) Name one such substance.
(ii) Explain the phenomenon involved.

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`(i) CuSO_4. 5H_2O`
`CuSO_4. 5 H_2Oto ^(Delta)CuSO_4|5H_2O`
(Blue) (White)
(ii) Explanation: On heating crystals losses water of crystallisation and regain it on cooling.
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