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Iodine crystals and vapour

Iodine crystals and vapour

A500/0155

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Credit

CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY

Caption

Iodine. Crystals of the element iodine (chemical symbol: I) heated to produce iodine vapour. Iodine is a violet-black non-metallic element which gives off a violet vapour. With a melting point of 113. Iodine is found in seawater and was formerly extracted from seaweed; it is now obtained from oil-well brines. Iodine is required as a trace element by most living organisms. In mammals it is concentrated in the thyroid gland as a constituent of thyroid hormones. Iodine was discovered by Courtois in 1812.

Release details

Model release not required. Property release not required.

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