change in price of the indigo crop
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Plant extraction of indigo requires several steps because the dye itself does not actually exist in nature. The chemical found in plant leaves is really indican, a precursor to indigo. The ancient process to extract indican from plant leaves and convert it toindigo has remained unchanged for thousands of years.
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Some species, particularly true indigo (Indigofera tinctoria) and Natal indigo (I. ... arrecta), were once an important source of indigo dye. The cultivation of indigo plants and the extraction of the dyestuff were an important industry in India up to the beginning of the 20th century.
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