25.8 MB (1.7 MB compressed)
2605 x 3468 pixels
22.1 x 29.5 cm ⏐ 8.7 x 11.6 in (300dpi)
POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Kettle limescale. Scanning electron micrograph (SEM) of fur or limescale (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. When this water is boiled or evaporated the calcium salts precipitate to form crystals. Magnification: x860 when printed 10cm high.
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