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2. Indigo dye - Wikipedia

   en.wikipedia.org/wiki/Indigo_dye

   Indigo dye is a dark blue crystalline powder that sublimes at 390–392 °C (734–738 °F). It is insoluble in water, alcohol, or ether, but soluble in DMSO, chloroform, nitrobenzene, and concentrated sulfuric acid. The chemical formula of indigo is C 16 H 10 N 2 O 2.

3. Natural dye - Wikipedia

   en.wikipedia.org/wiki/Natural_dye

   Blue colorants around the world were derived from indigo dye-bearing plants, primarily those in the genus Indigofera, which are native to the tropics. The primary commercial indigo species in Asia was true indigo (Indigofera tinctoria). India is believed to be the oldest center of indigo dyeing in the Old World. It was a primary supplier of ...

4. Vat dye - Wikipedia

   en.wikipedia.org/wiki/Vat_dye

   Vat dye. Vat dyes are a class of dyes that are classified as such because of the method by which they are applied. Vat dyeing is a process that refers to dyeing that takes place in a bucket or vat. The original vat dye is indigo, once obtained only from plants but now often produced synthetically. [1]

5. Navajo weaving - Wikipedia

   en.wikipedia.org/wiki/Navajo_weaving

   Navajo used indigo to obtain shades from pale blue to near black and mixed it with indigenous yellow dyes such as the rabbit brush (Ericameria nauseosa) plant to obtain bright green effects. Red was the most difficult dye to obtain locally.

6. Denim - Wikipedia

   en.wikipedia.org/wiki/Denim

   Denim fabric dyeing is divided into two categories: indigo dyeing (Indigo dye is a unique shade of blue) and sulfur dyeing (Sulfur dye is a synthetic organic dye and it is formed by sulphurisation of organic intermediates, this contains nitro or amino groups). Indigo dyeing produces the traditional blue color or shades similar to it.

7. African textiles - Wikipedia

   en.wikipedia.org/wiki/African_textiles

   The Yoruba of Nigeria and the Mandinka of Mali are recognized as experts in indigo dyeing. Natural dyes such as vegetable and mineral dyes were widely used including blue from indigo which is obtained from a stream that runs from the Senegal River down to the Cameron border rich in Lonchocarpus cyanescens( a species of shrub from family ...