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Indigo dye is an organic compound with a distinctive blue color. Indigo is a natural dye extracted from the leaves of some plants of the Indigofera genus, ...
Indigo: Indigo blue Vat blue 1 73000 indigoid 482-89-3: Indigo carmine (synthetic) Indigo Acid blue 74 73015 indigoid 860-22-0: Indigo carmine (natural) Natural blue 2 Food blue 1 75781 natural 860-22-0: Indocyanine green: Cardiogreen cyanine 3599-32-4: Induline: Solvent blue 7 50400 azine 8004-98-6: Iodine green 42556 triarylmethane 33231-00-4 ...
Indigo carmine, or 5,5′-indigodisulfonic acid sodium salt, is an organic salt derived from indigo by aromatic sulfonation, which renders the compound soluble in water. Like indigo, it produces a blue color , and is used in food and other consumables , cosmetics, and as a medical contrast agent and staining agent; it also acts as a pH indicator .
It was a primary supplier of indigo dye to Europe as early as the Greco-Roman era. The association of India with indigo is reflected in the Greek word for the dye, which was indikon (ινδικόν). The Romans used the term indicum, which passed into Italian dialect and eventually into English as the word indigo.
The Maya blue pigment is a composite of organic and inorganic constituents, primarily indigo dyes derived from the leaves of anil (Indigofera suffruticosa, called ch'oj in Mayan [1]) plants combined with palygorskite, a natural clay and type of fuller's earth.
Indigo dye is the color that is called Añil (the Spanish word for "indigo dye") in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm.
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The pigment was derived from crushed indigo plants. [4] Indigo was a common source for haint blue prior to the American Revolution , when indigo was a common crop for plantations in the American South , but the tradition survived well after the decline in indigo dye cultivation.
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