Indigo
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A one-page encyclopedia entry on indigo as a blue dye-stuff, from Zell's Encyclopedia. It covers the source plants (Indigofera species and woad), the fermentation and precipitation process used to make commercial indigo, and its chemical constituents such as indigotine, indigo-red and indigo-brown. It also explains why indigo must be reduced to soluble white indigo for dyeing, with a deoxidizing agent and an alkali, and then developed blue by exposure to air. An engraving shows the Indigofera tinctoria plant, a pod, and a block of indigo.
- Type
- Article
- Date
- 1876
- Language
- English
- Pages
- 1
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From Ralph Griswold's Digital Archive, delivered by the University of Arizona.
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