What is the colour of anhydrous copper sulphate?

The colour of anhydrous copper sulphate is white. Copper sulphate exists in two forms: hydrated and anhydrous. Hydrated copper sulphate contains water molecules and appears blue. When the water is removed by heating, it becomes anhydrous copper sulphate, which is white in color.

This color change from blue to white is used in science experiments to test for the presence of water. When anhydrous copper sulphate is added to a substance and it turns blue, it means water is present. This property makes it a simple and reliable indicator for water.