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Carmine is a pigment of a bright red color obtained from the carminic acid produced by some scale insects, such as the cochineal and the Polish cochineal, and is used as a general term for a particularly deep red color of the same name. Carmine is used in the manufacture of artificial flowers, paints, crimson ink, rouge, and other cosmetics, and is routinely added to food products such as yogurt and certain brands of juice, most notably those of the ruby-red variety. Carmine can be used as a staining agent in histology, as a Best's carmine to stain glycogen, mucicarmine to stain acidic mucopolysaccharides, and carmalum to stain cell nuclei.Carmine was used in dyeing textiles and in painting since antiquity.
Indigo is an organic compound with a distinctive blue color. It is the blue often associated with blue jeans.Indigo is among the oldest dyes to be used for textile dyeing and printing. Many Asian countries, such as India, China, Japan, and Southeast Asian nations have used indigo as a dye.It is insoluble in water, alcohol, or ether, but soluble in DMSO, chloroform, nitrobenzene, and concentrated sulfuric acid.Indigo and some of its derivatives are known to be ambipolar organic semiconductors when deposited as thin films by vacuum evaporation.
Natural Black #1 is produced from logwood and is for the dying of silk to be used in medical sutures. Natural Black #1 requires a mordant to develop the color and to fix the organic dye.
Natural Brown #12 used in dying various natural fibers and paper.
Natural Red #24 can be readily used for dying leather and other natural fibers.
Natural Yellow #11 is used for dying many natural fibers, and is commonly used for dying leather.
Orcein are names for dyes extracted from several species of lichen. Orcinol is extracted from such lichens. It is then converted to orcein by ammonia and air. In traditional dye-making methods, urine was used as the ammonia source.It is red in acidic pH and blue in alkaline pH. It forms dark brown crystals. It is a mixture of phenoxazone derivates - hydroxyorceins, aminoorceins, and aminoorceinimines.
Quercitron is a yellow natural dye obtained from the bark of the Eastern Black Oak.Quercetin is a crystalline powder of a brilliant citron yellow color, entirely insoluble in cold water and dissolving only sparingly in hot water, but quite soluble in alcohol.Chemically, quercetin is a member of a fairly extensive class of natural coloring matters derived from phenyl benzoyl-pyrone or flavone.
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