EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Hydrated copper (II) sulphate crystals, coloured scanning electron micrograph (SEM). 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 (with five molecules of water for each molecule of copper sulphate) is the bright blue seen here. Magnification: x53 when printed 10 centimetres wide.
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