'Kettle fur' limescale

'Kettle fur' limescale

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Credit: POWER AND SYRED/SCIENCE PHOTO LIBRARY

Caption: Kettle fur. False-coloured scanning electron micrograph of fur (calcium carbonate and calcium sulphate crystals) from a domestic kettle. The fur is the result of repeated use of the kettle in a hard water area. Water hardness is a qualitative measure of dissolved calcium salts; calcium bicarbonate (temporary) and calcium sulphate (permanent). When water containing calcium bicarbonate is boiled, the soluble bicarbonate breaks down to give the insoluble calcium carbonate. When water containing calcium sulphate is evaporated, boiled or dries out, the calcium sulphate precipitates from solution. Magnification x2000 at 6x4.5cm size.

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Keywords: calcium carbonate, chemical, chemistry, compound, compounds, crystal, crystals, fur, hard water, kettle, kettle fur, limescale, limescale crystals, scanning electron micrograph, sem

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