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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 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.
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 ...
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 ...
Indigo blue: K Potassium: Lilac ; invisible through cobalt blue glass Li Lithium: Carmine red; invisible through green glass: Mg Magnesium: Colorless due to Magnesium Oxide layer, but burning Mg metal gives an intense white: Mn(II) Manganese(II) Yellowish green: Mo Molybdenum: Yellowish green: Na Sodium: Bright yellow; invisible through cobalt ...
Carmine (/ ˈ k ɑːr m ə n, ˈ k ɑːr m aɪ n /) – also called cochineal (when it is extracted from the cochineal insect), cochineal extract, crimson lake, or carmine lake – is a pigment of a bright-red color obtained from the aluminium complex derived from carminic acid. [2] Specific code names for the pigment include natural red 4, C.I ...
Anthraquinone dyestuffs are structurally related to indigo dyestuffs and are classified together with these in the group of carbonyl dyes. [2] Members of this dye group can be found in natural dyes as well as in synthetic dyes. Anthraquinone dyestuffs are represented in mordant and vat, but also in reactive and disperse dyes.
Furthermore, these colors were organized in "opponent" pairs, red vs. green and yellow vs. blue so that mixing could occur across pairs (e.g., a yellowish green or a yellowish red) but not within a pair (i.e., reddish green cannot be imagined). An achromatic opponent process along black and white is also part of Hering's explanation of color ...