Search Results for: Vegetable textile fibres tow
best known are madder, cochineal, logwood, and indigo. the distinction between natural dyes and natural pigments is often arbitrary. synthetic dye an organic colorant derived from coal tar - and petroleum-based intermediates and applied by a variety of methods to impart bright, permanent colours to textile
fibres . organic dyes were first synthesized by perkin in england and were later developed by hofmann in germany. some, termed 'fugitive', are unstable to sunlight, heat, and acids or bases; others, called 'fast', are not. direct (or substantive) dyes can be used effectively without 'assistants'; indirect...
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