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Indigo dye is an organic compound with a distinctive blue color. ... Indigo dye is a dark blue crystalline powder that sublimes at 390–392 °C (734–738 °F).
The first archaeological finds of woad seeds date to the Neolithic period. The seeds have been found in the cave of l'Audoste, Bouches-du-Rhône, France.Impressions of seeds of Färberwaid (Isatis tinctoria L.) or German indigo, of the plant family Brassicaceae, have been found on pottery in the Iron Age settlement of Heuneburg, Germany.
True indigo is a shrub 1–2 metres (3 ft 3 in – 6 ft 7 in) high. It may be an annual, biennial, or perennial, depending on the climate in which it is grown. It has light green pinnate leaves and sheafs of pink or violet flowers. The rotenoids deguelin, dehydrodeguelin, rotenol, rotenone, tephrosin and sumatrol can be found in I. tinctoria. [3]
Hair styling powder, often regarded as a modern innovation, can actually trace its origins back to the late 16th and early 17th century, powdered substances, such as starch or flour, were employed to enhance wigs and natural hair, [2] during the reign of Henry IV of France. [3]
The 18th-century English politician Charles Fox was a fashionable macaroni in his youth and tinted his hair with blue powder. [4] A group of Spanish women with blue rinsed hair. In 1913–1914, just before World War I, there was a vogue for dyed brightly-colored hair in different shades such as blue, violet or emerald. This started in Paris and ...
The dyes are finely ground in the presence of a dispersing agent and sold as a paste, or spray-dried and sold as a powder. Their main use is to dye polyester, but they can also be used to dye nylon, cellulose triacetate, and acrylic fibers. In some cases, a dyeing temperature of 130 °C (266 °F) is required, and a pressurized dyebath is used ...
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