The influence of weathering on the chemical and physical properties of wool fibers has been investigated. The weathered fiber tips are modified to a great extent by weather ing; this is shown in changes in solubilities and in the amino acid composition. As a result of photochemical degradation, fibers show a decrease in tenacity and extension as well as in compressional resistance. Weathered fiber tips showed, in spite of removal of a great number of scales, a better feltability than the fiber roots. On the basis of these results a theory of felting is presented and discussed.
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