DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Limescale. Coloured scanning electron micrograph (SEM) of limescale from a domestic kettle. Limescale, which occurs when hard water is boiled, consists of crystals of calcium carbonate and crystals of calcium sulphate (needles) that have precipitated out of the water. Magnification: x800 when printed 10 centimetres wide.
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