Azo dyes

Fast Yellow AB is an azo dye.

Ponceau 4R (known by more than 100 synonyms, including as C.I. 16255, Cochineal Red A, C.I. Acid Red 18, Brilliant Scarlet 3R, Brilliant Scarlet 4R, New Coccine, is a synthetic colourant that may be used as a food colouring. It is denoted by E Number E124. Its chemical name is 1-(4-sulpho-1-napthylazo)- 2-napthol- 6,8-disulphonic acid, trisodium salt. Ponceau (French for "poppy-coloured") is the generic name for a family of azo dyes. It is used in Europe, Asia and Australia, but has not been approved by the US FDA.

Citrus Red 2, Citrus Red No.

Congo red is the sodium salt of 3,3′-([1,1′-biphenyl]-4,4′-diyl)bis(4-aminonaphthalene-1-sulfonic acid) (formula: C32H22N6Na2O6S2; molecular weight: 696.66 g/mol).

Tartrazine is a synthetic lemon yellow azo dye primarily used as a food coloring.

Methyl orange is a pH indicator frequently used in titrations because of its clear and distinct colour change.

Azorubine, carmoisine, Food Red 3, Azorubin S, Brillantcarmoisin O, Acid Red 14, or C.

Sunset Yellow FCF (also known as Orange Yellow S, or C.I. 15985) is a petroleum-derived orange azo dye with a pH dependent maximum absorption at about 480 nm at pH 1 and 443 nm at pH 13 with a shoulder at 500 nm.

Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.

Eriochrome Black T is a complexometric indicator that is used in complexometric titrations, e.

Trypan blue is a vital stain used to selectively colour dead tissues or cells blue.

Allura Red AC is a red azo dye that goes by several names including Allura Red, Food Red 17, C.

Orange GGN, also known as alpha-naphthol orange, used to be used as a food dye.

Sudan I (also commonly known as CI Solvent Yellow 14 and Solvent Orange R), is an organic compound, typically classified as an azo dye.

Amaranth, FD&C Red No.

Yellow 2G is a food coloring denoted by E number E107.

Sudan Red 7B, also known as Solvent Red 19, Ceres Red 7B, Fat Red 7B, Hexatype carmine B, Lacquer red V3B, Oil violet, Organol bordeaux B, Sudanrot 7B, Typogen carmine, and C.

Ponceau 2R, Xylidine ponceau, Ponceau G, Red R, Acid Red 26, Food Red 5, or C.

Para Red (paranitraniline red, Pigment Red 1, C.I. 12070) is a chemical dye.

Sudan II (C18H16N2O) is a lysochrome (fat-soluble dye) azo dye used for staining of triglycerides in frozen sections, and some protein bound lipids and lipoproteins on paraffin sections.

Pigment Yellow 10 is an organic compound that is classified as a Monoazopyrazolone pigment.

Mordant brown 33 (MB33) is 2,4-diamino-5-(2-hydroxy-5-nitrophenylazo) benzene sulfonic acid sodium salt.

Alizarine Yellow R is a yellow colored azo dye made by the diazo coupling reaction.

Acid orange 7, also known as 2-naphthol orange and Orange II, is a dye.

Acid red 88 (also named Solid Red A, 2-Naphthol Red, Toyo roccelline, Fast Red A and so on) is a red azo dye.

Azo violet (4-(4-Nitrophenylazo)resorcinol) is an organic compound with the chemical formula C12H9N3O4.

Acid orange 5 is a compound with formula Na(C6H5NHC6H4N=NC6H4SO3).

Solvent Red 26, also known as C.

Sudan Black B (C29H24N6) is a nonfluorescent, relatively thermostable lysochrome (fat-soluble dye) diazo dye used for staining of neutral triglycerides and lipids on frozen sections and some lipoproteins on paraffin sections.

T-1824 or Evans Blue, often incorrectly rendered as Evan's Blue, is an azo dye which has a very high affinity for serum albumin.

Aniline Yellow is a yellow azo dye and an aromatic amine.

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.

Sudan III is a lysochrome (fat-soluble dye) diazo dye.

Mordant red 19 is a mordant used in textile dyeing with the chemical formula C16H13ClN4O5S.

Bismarck brown Y is a diazo dye.

Methyl yellow, or C.

Red 2G is a synthetic red azo dye.

Janus Green B is a basic dye and vital stain used in histology.

Prontosil is an antibacterial drug discovered in 1932 by a research team at the Bayer Laboratories of the IG Farben conglomerate in Germany.

D&C Red 33 also known as Acid Red 33 or simply Red 33 is a red azo dye used as a colorant in mouthwashes, dentifrices, cosmetics, and hair dyes.

Orange B is a food dye from the azo dye group.

Sudan Yellow 3G, also known as Solvent Yellow 16, C.

Ponceau S, Acid Red 112, or C.

Hydroxynaphthol blue is an azo dye.

Scarlet GN, or C.

Biebrich scarlet (C.I. 26905) is a molecule used in Lillie's trichrome.

Sudan Red G is a yellowish red lysochrome azo dye.

Orange G or orange gelb is a synthetic azo dye used in histology in many staining formulations.

Alcian yellow is an azo dye with the formula (CH3[(CH3N)2CS]2C6H2SNCC6H4)2N2.

Sudan IV (C24H20N4O) is a lysochrome (fat-soluble dye) diazo dye used for the staining of lipids, triglycerides and lipoproteins on frozen paraffin sections.

Brilliant Black BN, Brilliant Black PN, Brilliant Black A, Black PN, Food Black 1, Naphthol Black, C.

Brown HT, also called Chocolate Brown HT, Food Brown 3, and C.

Lithol Rubine BK is a reddish synthetic azo dye.

Direct Blue 1 is an organic compound with the chemical formula C34H28N6O16S4, used as a dye.

Disperse Orange 1 (4-anilino-4'-nitroazobenzene) is a dye of the azobenzene class.

Amido black 10B is an amino acid staining diazo dye used in biochemical research to stain for total protein on transferred membrane blots, such as the western blot.

Arylide yellow, also known as Hansa yellow and monoazo yellow, are a family of organic compounds used as pigments.

Ponceau 6R, or Crystal ponceau 6R, Crystal scarlet, Brilliant crystal scarlet 6R, Acid Red 44, or C.

Oil Yellow DE is a synthetic greenish-yellow azo dye which has the appearance of a reddish yellow powder.

Solvent Yellow 124 is a yellow azo dye used in European Union as a fuel dye.

Chrysoine resorcinol can be used as a pH indicator with a color change between pH 11 and pH 12.