Azo dyes Azo dyes Alizarin Yellow R (Chrome Orange, Mordant Orange 1) is a yellow colored azo dye made by diazo coupling reaction. It usually comes as a sodium salt. In its pure form it is a rust-colored solid. It is a pH indicator. ...more on Wikipedia about "Alizarin Yellow R"
Allura Red AC, also called Allura Red, Food Red 17, C.I. 16035, and FD&C Red 40, is a red azo dye. It is used as a food dye and its E number is E129. It has the appearance of a dark red powder. It usually comes as a sodium salt, but can be also in the form of calcium and potassium salt. It is soluble in water. In water solution, its maximum absorbance lies at about 504 nm. ...more on Wikipedia about "Allura Red AC"
Amaranth, FD&C Red No. 2, C.I. Food Red 9, Acid Red 27, Azorubin S, or C.I. 16185, is a dark red to purple azo dye once used as a food dye and to color cosmetics, but from 1976 it is banned in the United States by FDA as it is a suspected carcinogen. It usually comes as a trisodium salt. It has the appearance of reddish-brown, dark red to purple water-soluble powder that decomposes at 120 °C without melting. Its water solution has absorption maximum at about 520 nm. Amaranth was made from amaranth plants. ...more on Wikipedia about "Amaranth (dye)"
Amido black 10B, also called Amidoschwarz, Naphthol blue black, Acid Black 1, and C.I. 20470, is an amino acid staining diazo dye used in criminal investigations to detect blood present with latent fingerprints. It stains the proteins in blood a blue-black color. Amido Black can be either methanol or water based as it readily dissolves in both. With picric acid, in a van Gieson procedure, it can be used to stain collagen and reticulin. ...more on Wikipedia about "Amido black"
Azorubine, carmoisine, Food Red 3, Azorubin S, Brillantcarmoisin O, Acid Red 14, or C.I. 14720 is a synthetic red food dye from the azo dye group. It usually comes as a disodium salt. It is a red to maroon powder. It is used for the purposes where the food is heat-treated after fermentation. It has E number E122. Some of the foods it can be present in are blancmange, marzipan, Swiss roll, jams, preserves, yoghurts, jellies, breadcrumbs, and cheesecake mixes. ...more on Wikipedia about "Azorubine"
Bismarck brown Y, or Bismarck brown, Manchester brown, Phenylene brown, Basic Brown 1, or C.I. 21000, is a diazo dye. It is used in histology for staining tissues. It stains acid mucins to yellow color. It can be used with live cells. It is also used to stain cartilage in bone specimens. It is also used as one of Kasten's Shiff-type reagents in the periodic acid-Schiff stain to stain cellulose, and in Feulgen stain to stain DNA. ...more on Wikipedia about "Bismarck brown Y"
Black 7984, Food Black 2, or C.I. 27755, is a brown-to-black synthetic diazo dye. It usually comes as a tetrasodium salt. ...more on Wikipedia about "Black 7984"
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Brilliant Black BN, Brilliant Black PN, Brilliant Black A, Black PN, Food Black 1, Naphthol Black, C.I. Food Brown 1, or C.I. 28440, is a synthetic black diazo dye. It is soluble in water. It usually comes as tetrasodium salt. It has the appearance of solid, fine powder or granules. Calcium and potassium salts are allowed as well. ...more on Wikipedia about "Brilliant Black BN"
Chrysoine resorcinol (Chrysoine; Resorcinol Yellow; Gold Yellow; C.I. Food Yellow 8; C.I. Acid Orange 6; C.I. 14270; Yellow T; Tropaeolin O; Tropaeolin R; sodium p-(2,4-dihydroxyphenylazo)benzenesulfonate) is a colourant which is used as a food additive. ...more on Wikipedia about "Chrysoine resorcinol"
Citrus Red 2, Citrus Red No. 2, C.I. Solvent Red 80, or C.I. 12156 is an artificial dye. As a food dye, it is permitted by FDA since 1956 only for use on skin on some Florida oranges. While the dye is a carcinogen, it does not penetrate the orange peel into the pulp. Its chemical formula is 18 16 2 3. It is an orange to yellow solid or a dark red powder with melting point is 156 °C. ...more on Wikipedia about "Citrus Red 2"
Congo red is the sodium salt of benzidinediazo-bis-1-naphtylamine-4-sulfonic acid (formula: C32H22N6Na2O6S2; molecular weight: 696.66 g/mol). It is a secondary diazo dye. Congo red is water soluble, yielding a red colloidal solution; its solubility is better in organic solvents such as ethanol. ...more on Wikipedia about "Congo red"
Eriochrome Black T is a complexometric indicator that is part of the complexometric titrations, eg. in the water hardness determination process. It is an azo dye. ...more on Wikipedia about "Eriochrome Black T"
Fast Yellow AB, Fast Yellow, Acid Yellow, C.I. 13015, C.I. 14270 or Food Yellow 2 is an azo dye denoted by E number E105. It is used as a food dye. It is now delisted in both Europe and USA and is not used anymore, as toxicological data shown it is harmful. ...more on Wikipedia about "Fast Yellow AB"
Lithol Rubine BK, Pigment Rubine, Carmine 6B, Brilliant Carmine 6B, Permanent Rubin L6B, Litholrubine, Latolrubine, C.I. Pigment Red 57, C.I. Pigment Red 57:1, D&C Red No. 7, or C.I. 15850:1, is a reddish synthetic azo dye. It has the appearance of a red powder, slightly soluble in hot water, insoluble in cold water, and insoluble in ethanol. When dissolved in dimethylformamide, its absorption maximum lies at about 442 nm. It usually comes as a calcium salt. ...more on Wikipedia about "Lithol Rubine BK" The article you are reading is from http://www.shortopedia.com shortopedia
Methyl Orange is a pH indicator frequently used in titrations. It is also toxic. ...more on Wikipedia about "Methyl orange"
Methyl Red, also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. Its formula is C15H15N3O2. It is an azo dye. It is a dark red crystalline powder with melting point between 179-182 °C. ...more on Wikipedia about "Methyl red"
Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator. ...more on Wikipedia about "Methyl yellow"
Oil Red O (Solvent Red 27, Sudan Red 5B, C.I. 26125, C26H24N4O) is a lysochrome (fat-soluble dye) diazo dye used for staining of neutral triglycerides and lipids on frozen sections and some lipoproteins on paraffin sections. It has the appearance of a red powder with maximum absorption at 518(359) nm. ...more on Wikipedia about "Oil Red O"
Orange B is a food dye from the azo dye group. It is approved by FDA for use only in hot dog and sausage casings or surfaces, only up to 150 ppm of the finished food weight. It usually comes as disodium salt. ...more on Wikipedia about "Orange B"
Orange G, Acid Orange 10, or C.I. 16230, is a synthetic azo dye used in histology in many staining formulations. It usually comes as a disodium salt. It has the appearance of orange crystals or powder. ...more on Wikipedia about "Orange G"
Orange GGN, also known as alpha-naphthol orange, is a food dye. In Europe it is denoted by the E Number E111. It is the disodium salt of 1-(m-sulfophenylazo)-2-naphthol-6-sulfonic acid. It is currently delisted in Europe and USA, as toxicological data shown it is harmful. ...more on Wikipedia about "Orange GGN"
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Para Red (paranitraniline red, Pigment Red 1, C.I. 12070, Recolite Para Red B, Carnelio Para Red BS) is a chemical dye. In the United Kingdom, the dye is not permitted in food. Chemically, the dye is similar to Sudan I. The UK's Food Standards Agency (FSA) stated that "the Agency’s independent scientific experts have advised that, although there are very limited data available, it would be prudent to assume that it could be a genotoxic carcinogen". ...more on Wikipedia about "Para Red"
Ponceau 2R, Xylidine ponceau, Ponceau G, Red R, Acid Red 26, Food Red 5, or C.I. 16150 is a red azo dye used in histology for staining. It is easily soluble in water and slightly in ethanol. It usually comes as a disodium salt. ...more on Wikipedia about "Ponceau 2R"
Ponceau 4R (also known as Food Red 7, C.I. 16255, Cochineal Red A, New Coccine, Acid Red 18, SX purple) is a colourant that may be added to foods to induce a colour change. It is denoted by E Number E124, and has the capacity for inducing an allergic reaction. Its chemical name is trisodium salt of 1-(4-sulpho-1-napthylazo)- 2-napthol- 6,8-disulphonic acid. ...more on Wikipedia about "Ponceau 4R"
Ponceau 6R, or Crystal ponceau 6R, Crystal scarlet, Brilliant crystal scarlet 6R, Acid Red 44, or C.I. 16250, is a red azo dye. It is soluble in water and slightly soluble in ethanol. It is used as a food dye, with E number E126. It is also used in histology, for staining fibrin with the MSB Trichrome stain. It usually comes as disodium salt. ...more on Wikipedia about "Ponceau 6R"
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