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Wool is produced by sheep. It be naturally white, yellowish, grey-brown or black, although wool is easily dyed other colours; is very elastic and quite resistant to acids. Silk is made by the larvae of insects called silk moths; is ery strong and elastic material, good thermal and electrical insulator. Cotton comes from the fruit of the cotton plant; is white; is light, elastic, permeable and resistant to acid, good insulator. Esparto comes from leaves of esparto grass plants; are strong and resistant. Linen comes from flax plant; is white or beige; elastic and flexible, good thermal conductor; resistant to chlorine and bleach. Bamboo comes from bamboo plants; is porous, permeable and biodegradable.

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