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Dye is obtained from the processing of the plant's leaves. They are soaked in water and fermented in order to convert the glycoside indican naturally present in the plant to the blue dye indigotin. The precipitate from the fermented leaf solution is mixed with a strong base such as lye.
Indigo is a natural dye extracted from the leaves of some plants of the Indigofera genus, in particular Indigofera tinctoria. Dye-bearing Indigofera plants were commonly grown and used throughout the world, particularly in Asia, with the production of indigo dyestuff economically important due to the historical rarity of other blue dyestuffs.
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The indigo dyeing process is centred in the Naju area, where regular flooding of the Yeongsan River provides an ideal wetland environment for the indigo plant. [2] The plants are harvested in July, before they flower, and the leaves are stored in earthenware jars of water for several days to extract the pigment.
If plants that yield yellow dyes are common, plants that yield green dyes are rare. Both woad and indigo have been used since ancient times in combination with yellow dyes to produce shades of green. Medieval and Early Modern England was especially known for its green dyes.
Scraps of Indigo-dyed fabric likely dyed with plants from the genus Indigofera discovered at Huaca Prieta predate Egyptian indigo-dyed fabrics by more than 1,500 years. [8] Colonial planters in the Caribbean grew indigo and transplanted its cultivation when they settled in the colony of South Carolina and North Carolina where people of the ...
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.
Indigofera galegoides is a species of flowering plant in the family Fabaceae, native to India, South East Asia, Malesia, and southern China. [1] It is a shrub usually 2 m (6 ft) high and indigo dye may be extracted from it by the same harvesting and processing methods as Indigofera tinctoria. [2] It grows in open places and valleys. [3]