Abstract
The results of a previous investigation by the authors have been confirmed. It has been established that the size and shape of silk filaments are characteristic for different breeds of silk worms and that differences in size and shape account for a most troublesome cause of two-tone dyeing which cannot be oorrected by chemical treatment.
1. Differences in shape (diameter ratio) cause two-tone dyeing.
2. Differences in size (mean diameter) cause two-tone dyeing.
3. The larger filaments dye darker.
4. The flatter filaments dye darker.
Two-tone dyeing becomes noticeable when the difference in diameter ratio (shape) exceeds .03 and difference in mean diameter (size) exceeds 0.7 micron. In grading 40 ten-bale lots of raw silk according to filament shape and size, two-thirds were sufficiently uniform to show no two-tone dyeing within ten-bale lots, and one-quarter were sufficiently uniform to show no two-tone dyeing within or among ten-bale lots.
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