Kemp is a brittle, weak fibre forming the residual traces of a secondary coat in some breeds of sheep, which may be mixed with normal fibres in a wool fleece. This hair is not desirable in a fleece, as it does not accept dye, minimising both the quality and the value of the wool. Kemp fibre is also hollow, which is the reason it does not hold dye.[1]
Original source: https://en.wikipedia.org/wiki/Kemp (wool).
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