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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 .
Indigo carmine, also known as indigo, is an indigo derivative which is also used as a colorant. About 20,000 tonnes are produced annually, again mainly for the production of blue jeans. [ 1 ] It is also used as a food colorant, and is listed in the United States as FD&C Blue No. 2.
The glucose solution is added to the solution containing indicator (dye indigo carmine) the color changes occur. This reaction is also known as chemical clock experiment because concentrations of the products and reactants changed over the specific period. [22] When the solution is shaken, oxygen dissolves in the solution and oxidizes indigo ...
For this test, the patient takes oral phenazopyridine (Pyridium) 200 mg three times a day, and indigo carmine or methylene blue is filled into the empty urinary bladder via a urethral catheter. Pyridium turns urine orange in the kidneys, and methylene blue (or indigo carmine) turns urine blue in the bladder. [1] A tampon is placed into the ...
This is because wool is soluble in caustic soda solutions. Instead, it is possible to dye wool at room temperatures with indigo (vat blue 1) and other low substantive vat dyes using soda ash as the alkali source with very little strength loss. Vat red 10, vat violet 13 and vat orange 1 can be applied in this manner as well. [2]
Indigo carmine, a food colorant also known as FD&C Blue 2 Brilliant blue FCF , a food colorant also known as CI Food Blue 2, more commonly known as FD&C Blue 1 Topics referred to by the same term
The following other wikis use this file: Usage on ar.wikipedia.org قرمز النيلة; Usage on azb.wikipedia.org ایندیقو کرمین; Usage on bs.wikipedia.org
In China, dyeing with plants, barks and insects has been traced back more than 5,000 years. [1] Natural insect dyes such as Tyrian purple and kermes and plant-based dyes such as woad , indigo and madder were important elements of the economies of Asia and Europe until the discovery of man-made synthetic dyes in the mid-19th century.