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Acid dye

Acid dye refers to the dyestuff containing a sulfonic acid group, a carboxyl, a hydroxy or other soluble group in the molecular structure and used in acid or neutral dye bath. According to the chemical structure it can be divided into azo type, triphenylmethane type, anthraquinone type, anthracene oxygen type and nitroso type pyrazolone type. Acid dyestuff is widely used, mainly as direct dyestuff for protein fibers (such as wool, silk) and polyamide fibers, protein. And the dyeing needs to be conducted in an acidic solution. It’s mainly used for nylon, wool, leather, silk and others. Direct dyes or basic dyes are applied in paper dyeing far more often than acid dyestuff.

According to the molecular structure and dyeing conditions of the acid dyestuff, it can be divided into strong acid dyes, weak acid dyes, acid mordant dyes, acid-premetallized dyes and neutral dyes. Acid dyestuff is mainly used for wool, silk, leather and nylon and other fibers with its vivid luster and wild chromatogram.

Strong acid dyes whose molecules are relatively small, have bright color and good levelness but a stronger affinity for the wool fibers, and need to be used in strong acidic dye bath (pH≤4). The main chemical structures of Strong acid dyes are azo, anthraquinone, triarylmethane and oxygen anthracene type. For example, acid Bright Yellow 2G (C. I. Acid Yellow 17), acid anthraquinone blue (C. I. Acid Blue 25), acid Lake Blue A (C. I. Acid Blue 7) and acid Rose Red B (C. I. Acid Red 52), etc. are all strong acid dyes.

Weak acid dyes have more complex molecules than strong acid dyes, and relatively less water-soluble groups. They have weaker affinity for wool fiber, and can be used in weakly acidic or nearly neutral dye bath. In addition to the ionic bonds between the anions of dyes and the cations of wool molecules, the two non-polar molecules combine by means of van der Waals attraction. So weak acid dyes have a poor levelness but an excellent wash fastness, therefore they are also known as milling dyes. The main chemical structures of weak acid dyes are the types of azo and anthraquinone. For example, weak acid black BR (C. I. Acid Black 24), weakly acidic Brilliant Blue RAW (C. I. Acid Blue 80) are weak acid dyes.

After treated by metal mordant (Chromium salts), acid mordant dyes generate the dye-metal complex on the fiber, which can improve their resistance to sunlight exposure and wetness. But such treatment will leave the dyed products in a darker hue, make their shade and color-matching less manageable and complicate the dyeing procedures.

Acidic metal complex dyes are a class acid dyes that can generate inner complex with some transition metals (such as copper, network, cobalt, etc.). In contrast with acid mordant dyes, acidic metal complex dyes generate the dye-metal complex with complexing agent first, and then dye the fiber, which is simpler than the dyeing procedure of acid mordant dyes.

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Structure Chemical Name CAS MF
Acid Blue 9 Acid Blue 9 2650-18-2 C37H39N3O9S3
Acid Yellow 118 Acid Yellow 118 12270-05-2
Acid Brown  50 Acid Brown 50 12269-86-2
Acid Black  26 Acid Black 26 6262-07-3 C32H21N5O7S2.2Na
disodium 3-[[5-chloro-2-(phenylmethoxy)phenyl]azo]-4-hydroxy-5-[[(p-tolyl)sulphonyl]amino]naphthalene-2,7-disulphonate disodium 3-[[5-chloro-2-(phenylmethoxy)phenyl]azo]-4-hydroxy-5-[[(p-tolyl)sulphonyl]amino]naphthalene-2,7-disulphonate 6826-53-5 C30H22ClN3Na2O10S3
Acid Red 260 Acid Red 260 12239-07-5
hydrogen bis[3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxybenzene-1-sulphonamidato(2-)]chromate(1-) hydrogen bis[3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxybenzene-1-sulphonamidato(2-)]chromate(1-) 30112-70-0 C32H27CrN10O8S2
Acid Green  68 Acid Green 68 61901-32-4
Acid Orange 154 Acid Orange 154
Acid Mordant Orange G Acid Mordant Orange G
ACID BROWN 420 ACID BROWN 420
disodium 5-(4-(4-sulphophenylazo)phenylazo)salicylate disodium 5-(4-(4-sulphophenylazo)phenylazo)salicylate 3564-27-0 C19H12N4Na2O6S
Acid Orange  94 Acid Orange 94 61724-28-5
Acid Blue 225 Acid Blue 225 12216-97-6
Acid Green  40 Acid Green 40 12219-87-3
Acid Blue 7BF Acid Blue 7BF
Acid Yellow 44 Acid Yellow 44 2429-76-7 C34H33N6NaO10S2
ACID BLACK 235 ACID BLACK 235
Acid Blue D Acid Blue D
Bentonite,calcium base Bentonite,calcium base
Acid Brown SS Acid Brown SS
ACID YELLOW 99 ACID YELLOW 99 10343-58-5 C16H11CrN4NaO9S
Acid Violet 48 Acid Violet 48 12220-51-8 C37H38N2Na2O9S2
ACID ORANGE 63 ACID ORANGE 63 15792-50-4 C35H26N6Na2O10S3
Acid Black 241 Acid Black 241 84170-03-6 C28H23N10NaO9S2
Acid Blue BGL Acid Blue BGL 88264-80-6 C22H16N3O6S.Na
disodium 2-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate disodium 2-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate 6359-95-1 C20H13ClN4Na2O7S2
90 ACID VIOLET 90 90 ACID VIOLET 90
Acid Violet 131 Acid Violet 131 6262-05-1
C.I.Acid Yellow 110 C.I.Acid Yellow 110
Acid Blue 158 Acid Blue 158 6370-08-7 C20H10CrN2NaO9S2-
sodium [3-[[3-[(3-amino-4-nitrophenyl)azo]-2,4-dihydroxyphenyl]azo]-4-hydroxybenzenesulphonato(3-)]cuprate(1-) sodium [3-[[3-[(3-amino-4-nitrophenyl)azo]-2,4-dihydroxyphenyl]azo]-4-hydroxybenzenesulphonato(3-)]cuprate(1-) 13011-68-2 C18H11CuN6NaO8S
disodium 2-[[1-(2,5-dichloro-4-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate disodium 2-[[1-(2,5-dichloro-4-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate 12220-64-3 C20H12Cl2N4Na2O7S2
Acidic sanding agent Acidic sanding agent
C.I.Acid Blue 350 C.I.Acid Blue 350
C.I.Acid Blue 25 C.I.Acid Blue 25
C.I.Mordant Green 17 C.I.Mordant Green 17
Mitsui Mitsui
ACID VIOLET 5 ACID VIOLET 5 10130-48-0 C25H23N4NaO10S3
MORDANT BROWN 4 MORDANT BROWN 4 6247-27-4 C13H12N6O5
ACID BLACK 2 ACID BLACK 2 80316-29-6 C48H35N9
Acid Black  58 Acid Black 58 12218-94-9 C40H35CrN6O12S2
hydrogen [4-[[4-(diethylamino)phenyl][4-[ethyl[(3-sulphonatobenzyl)amino]-o-tolyl]methylene]-3-methylcyclohexa-2,5-dien-1-ylidene](ethyl)(3-sulphonatobenzyl)ammonium, sodium salt hydrogen [4-[[4-(diethylamino)phenyl][4-[ethyl[(3-sulphonatobenzyl)amino]-o-tolyl]methylene]-3-methylcyclohexa-2,5-dien-1-ylidene](ethyl)(3-sulphonatobenzyl)ammonium, sodium salt 6505-30-2 C43H49N3O6S2.Na
Acid Brown K Acid Brown K
ACID BROWN85 (C.I. 34900) ACID BROWN85 (C.I. 34900) 77031-30-2
Navy Blue GR Navy Blue GR
C.I.Acid Brown 121 C.I.Acid Brown 121
Acid brilliant red Acid brilliant red
C.I.Acid Blue 45 C.I.Acid Blue 45
C.I.Acid Green 3 C.I.Acid Green 3
C.I.Acid Red 444 C.I.Acid Red 444
C.I. Acid Orange 142 C.I. Acid Orange 142 61901-39-1
Acid Scarlet Red Acid Scarlet Red
Acid Black 242 Acid Black 242 152521-11-4 C34H28N11NaO11S3
Acid Yellow PL Acid Yellow PL
C.I. Acid blue 72 C.I. Acid blue 72 12219-17-9
ACID BROWN 14 ACID BROWN 14 C26H16N4Na2O8S2
Acid Brown N2R Acid Brown N2R
ACID BLUE 80 ACID BLUE 80 4474-24-2 C32H31N2NaO8S2
CI 11875 CI 11875 6247-28-5 C13H10N4O6
disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate 6360-07-2 C18H17N4NaO8S2
disodium 8-[[3,3'-dimethoxy-4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxynaphthalene-1,3-disulphonate disodium 8-[[3,3'-dimethoxy-4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxynaphthalene-1,3-disulphonate 6548-30-7 C37H28N4Na2O12S3
Acid Black 210 Acid Black 210 99576-15-5 C34H28KN11O11S3
Acid Brown 121 Acid Brown 121 6487-04-3 C28H19N8NaO14S2
AcidChromeBlue AcidChromeBlue
LEATHERSPRAYINGBLUERL LEATHERSPRAYINGBLUERL 12269-81-7 [C32H18H6O8.Cr.Na];[C32H18N6O8.Co.Na]
C.I. Acid violet 66 C.I. Acid violet 66 12220-53-0
Acid Brown SLM Acid Brown SLM
acid red 54 acid red 54 6360-03-8 C16H14N3NaO7S2
C.I.Acid Black 77 C.I.Acid Black 77
Acid Fruit Green Acid Fruit Green
Acid Violet 4BS Acid Violet 4BS
Acid Complex Green B Acid Complex Green B
C.I.Acid Blue 185 C.I.Acid Blue 185
C.I.Mordant Green 17 C.I.Mordant Green 17
Acid Black 8GB Acid Black 8GB C22H14O9N6Na2S2
Acid brown 97 Acid brown 97 108347-99-5 C18H12CuN6NaO10S*
Acid Leather Spray Black Acid Leather Spray Black
C.I.Acid Brown 214 C.I.Acid Brown 214
Acid Blue 221 Acid Blue 221 12219-32-8
Acid Orange 116 Acid Orange 116 12220-10-9 C25H21N4NaO4S
disodium 3,3'-[cyclohexylidenebis[(2-methoxy-4,1-phenylene)azo]]bis(4,6-dihydroxynaphthalene-2-sulphonate) disodium 3,3'-[cyclohexylidenebis[(2-methoxy-4,1-phenylene)azo]]bis(4,6-dihydroxynaphthalene-2-sulphonate) 6459-69-4 C40H34N4Na2O12S2
Acid Green  54 Acid Green 54 61724-26-3
Acid Brown  97 Acid Brown 97 61901-18-6
Acid Yellow 232 Acid Yellow 232
Acid Black BNG Acid Black BNG
Acid Blue 185 Acid Blue 185
Acid Mordant Orange R Acid Mordant Orange R C13H9N3O5
Acid Red 111 Acid Red 111 6358-57-2 C37H31N4NaO10S3
CALCOCHROME FAST RED ECB CALCOCHROME FAST RED ECB
Acid Green 4 Acid Green 4 25424-72-0 C30H15FeN3NaO15S3(-2)
sodium 2-[3-(4-sulfonato-o-tolyliminio)-6-o-toluidino-3H-xanthen-9-yl]benzoate sodium 2-[3-(4-sulfonato-o-tolyliminio)-6-o-toluidino-3H-xanthen-9-yl]benzoate 6252-78-4 C20H10O2S
ACID BROWN 189 ACID BROWN 189 61724-15-0
ACID RED 252 ACID RED 252 61724-40-1
C.I.Acid Blue 25 C.I.Acid Blue 25
Acid yellow 17 Acid yellow 17 642-62-6 C16H9N4Na3O9S2
Navitan Green 5GL Navitan Green 5GL 12219-98-6
Acid Blue 183 Acid Blue 183 12217-22-0
Tracid Red 2bs Tracid Red 2bs 57741-47-6 C17H12ClF3N3NaO4S
Acid Orange  33 Acid Orange 33 6507-77-3 C34H31N4NaO8S2
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