Although indigo plants' natural habitat is tropical regions, they can also be successfully cultivated in other parts of the ...

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Xunzi, an ancient Chinese philosopher, said that Indigo blue is extracted from the indigo plant but is bluer than the plant it comes from. Chinese people began to collect indigo 3,000 years ago ...

Indigo factories were sited on river valleys for the water supply, and because indigo plants (several species of Indigofera) grow best in rich soils. Harsh working conditions in indigo fields and ...