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Indigo dye is an organic compound with a distinctive blue color. Indigo is a natural dye obtained from the leaves of some plants of the Indigofera genus, in particular Indigofera tinctoria. Dye-bearing Indigofera plants were once common throughout the world. It is now produced via chemical routes. Blue colorants are rare.
Tekhelet (Hebrew: תְּכֵלֶת təḵēleṯ; alternative spellings include tekheleth, t'chelet, techelet, and techeiles) is a highly valued dye described as either "sky blue" (Hebrew: תּכוֹל, romanized: tāk̲ol, lit.
Blocks of synthetic indigo. Blue pigments are natural or synthetic materials, traditionally made from minerals, Being water-insoluble by definition, blue pigments used to make the blue colors in inks and paints. Some major blue pigments are indigo, Prussian blue, and copper phthalocyanine. Historically lapis lazuli was important.
The first archaeological finds of woad seeds date to the Neolithic period. The seeds have been found in the cave of l'Audoste, Bouches-du-Rhône, France.Impressions of seeds of Färberwaid (Isatis tinctoria L.) or German indigo, of the plant family Brassicaceae, have been found on pottery in the Iron Age settlement of Heuneburg, Germany.
Lactarius indigo, commonly known as the indigo milk cap, indigo milky, indigo lactarius, blue lactarius, or blue milk mushroom, is a species of agaric fungus in the family Russulaceae. The fruit body color ranges from dark blue in fresh specimens to pale blue-gray in older ones.
Indigo dye is the basis for all the historical navy blue colors, since in the 18th, 19th, and early 20th century, almost all navy uniforms were made by dyeing them with various shades of indigo dye. Navy blue (Crayola)
Baptisia australis, commonly known as blue wild indigo or blue false indigo, is a flowering plant in the family Fabaceae (legumes). It is a perennial herb native to much of central and eastern North America and is particularly common in the Midwest, but it has also been introduced well beyond its natural range. [5]
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 .
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