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Indigo dye is an organic compound with a distinctive blue color. Indigo is a natural dye obtained from the leaves of some plants of the Indigofera genus, in particular Indigofera tinctoria. Dye-bearing Indigofera plants were once common throughout the world. It is now produced via chemical routes. Blue colorants are rare.
This indigo was used to make dye. The Germans had invented artificial dye so the demand for indigo fell. Some tenants paid more rent in return for being let off from growing indigo. However, during the First World War the German dye ceased to be available and so indigo became profitable again. Thus many tenants were once again forced to grow it ...
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]
[30] Woad and true indigo were once used but since the early 1900s, all indigo is synthetic. Produced on an industrial scale, indigo is the blue of blue jeans. Blue dyes are organic compounds, both synthetic and natural. For food, the triarylmethane dye Brilliant blue FCF is used for candies. The search continues for stable, natural blue dyes ...
In 2021, due to the COVID-19 crisis, the secondary school exams for classes X and XII had been cancelled. [ 9 ] In Academic Year (2021–2022) Central Board of Secondary Education (CBSE) Announced That Board Examinations of Class 10th and 12th will be conducted in two terms, the first term in November–December 2021 and second term in April ...
Eliza used her 1744 crop to make seed and shared it with other planters, leading to an expansion in indigo production. [9] She proved that colonial planters could make a profit in an extremely competitive market. Due to her successes, the volume of indigo dye exported increased dramatically from 5,000 pounds in 1745–46, to 130,000 pounds by ...
Common names include Chinese indigo, Japanese indigo and dyer's knotweed. [2] [3] [4] It is native to Eastern Europe and Asia. The leaves are a source of indigo dye. It was already in use in the Western Zhou period (c. 1045 BC – 771 BC), and was the most important blue dye in East Asia until the arrival of Indigofera from the south.
Denim fabric dyed with indigo Denim fabric dyed with indigo and black dyes and made into a shirt. Denim is a sturdy cotton warp-faced [1] textile in which the weft passes under two or more warp threads. This twill weave produces a diagonal ribbing that distinguishes it from cotton duck. Denim, as it is recognized today, was first produced in ...