Easy Method of the Determination of Raw and Bleached Cotton in Textiles
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A short technical article describing a dyeing method for telling raw (unbleached) cotton from bleached cotton in textiles, including mixtures of the two. Sieber compares it with the Congo-red and wetting-out tests and recommends Victoria Blue B, a basic triphenylmethane dye applied without mordant, which dyes raw cotton deeply and bleached cotton only lightly. He gives a dyeing procedure, explains how the leftover dyebath can be compared by colorimetry to estimate the percentage of each fiber, and describes microscopic examination. Three micrographs show cotton, ramie and flax fibers, raw and bleached.
- Type
- Article
- Date
- April 1929
- Language
- English
- Pages
- 2
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From Ralph Griswold's Digital Archive, delivered by the University of Arizona.
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