Wool |
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Wool has two properties that make it better for the production of yarn than hair or fur. It has scales that overlap like the shingles on a roof and it has bends (crimps). Hair has few if any scales and no crimp. The scales and crimp makes the wool stick together better for spinning or felting. The crimp also contributes to the bulk and loft of wool which is what gives it such good insultating properties. Different wools have different amounts of crimp, fine merino may have as many as 100 crimps per inch while a coarser yarn like karakul may only have one to two crimps per inch. For more information, Wikipedia.
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