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Pinacyanol is a cyanine dye. It is an organic cation, typically isolated as the chloride or iodide salts. The blue dye is prepared from 2-methylquinoline by quaternization with ethyl chloride or ethyl iodide. Condensation with formaldehyde results in coupling. Subsequent oxidation of the leuco intermediate gives the dye. [1]
FD&C Blue No. 1 Acid blue 9 Food blue 2 42090 triarylethlamine 3844-45-9: Brilliant cresyl blue: Cresyl blue BBS Basic dye 51010 oxazin 81029-05-2: Brilliant green: Malachite green G Zeylonka Basic green 1 42040 triarylmethane 633-03-4: Bromsulfthalein: BSP triarylmethane 71-67-0: Bromocresol green: BCG triarylmethane 76-60-8: Bromocresol ...
The dye is made from phenol, first oxidising it with oxalic acid and sulfuric acid to make a red substance called rosolic acid. By treating this with ammonia, a dye called red coralline or péonine was made. When reacted with aniline, the blue azuline was produced. This was invented by Jules Persoz in Paris.
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, 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 ...
Munjeet was an important dye for the Asian cotton industry and is still used by craft dyers in Nepal. [22] indigo Indigo is a deep blue derived from any of the indigo dye-bearing plants, primarily those in the genus Indigofera, especially true indigo (Indigofera tinctoria, also known as Indigofera sumatrana). [5] [6
The classic book about woad is The Woad Plant and its Dye [38] by J. B. Hurry, Oxford University Press of 1930, which contains an extensive bibliography. [39] A method for producing blue dye from woad is described in The History of Woad and the Medieval Woad Vat (1998) ISBN 0-9534133-0-6. [40] Woad is biodegradable and safe in the environment.
Egyptian blue was the first synthetic blue pigment. It was made from a mixture of silica, lime, copper, and an alkali. It was widely used in The Fourth Dynasty of ancient Egypt (c. 2613 to 2494 BC). [6] Egyptian blue is responsible for the blue colour seen very commonly in Egyptian faience.
Prussian blue pigment is significant since it was the first stable and relatively lightfast blue pigment to be widely used since the loss of knowledge regarding the synthesis of Egyptian blue. European painters had previously used a number of pigments such as indigo dye , smalt , and Tyrian purple , and the extremely expensive ultramarine made ...