Indigo
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A French encyclopedia article on indigo covering the source plants, extraction by fermentation, commercial types, quality testing and chemical properties. It gives instructions for setting up a cold indigo vat with potash, iron sulfate and lime, then a long section on reducing indigo with sodium hydrosulfite (Schutzenberger and de Lalande's process). It covers hydrosulfite preparation with zinc, vat dyeing of wool and cotton, and printing with reduced indigo (gummed blue) on textiles.
- Type
- Article
- Date
- 1891
- Language
- French
- Pages
- 4
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From Ralph Griswold's Digital Archive, delivered by the University of Arizona.
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