MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Copper (II) sulphate in hydrated (blue) and anhydrous (white) forms. This chemical compound varies in colour according to the amount of hydration. If no or little water is present (anhydrous), it is white or pale green. The pentahydrate form (with five molecules of water for each molecule of copper sulphate, CuSO4. The labels are compliant with the UN Globally Harmonized System of Classification and Labelling of Chemicals [GHS].
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