Tinted SEM of untreated wool.

Tinted SEM of untreated wool.

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Wool. False-colour scanning electron micrograph of a sample of untreated wool from a Herdwick sheep. Two types of hair are visible; thin, solid (normal) hairs and thicker, hollow, insulating hairs. The broken end of one of the thick hairs reveals its internal honeycomb structure; it is filled with air pockets and forms an excellent insulating material for both sheep and man. Magnification: x40 at 35mm size.

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Keywords: hair, insulation, material, materials, sheep, sheep's wool, wool

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