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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 Green 28 Acid Green 28 12217-29-7 C34H32N2Na2O10S2
Acid Blue 138 Acid Blue 138 1324-53-4 C32H36N2Na2O8S2
Acid Red 374 Acid Red 374 6507-78-4 C38H29N4Na3O11S3
ALIZARIN RUBINOL R ALIZARIN RUBINOL R 4478-76-6 C24H19N2NaO5S
ACID BLUE 29 ACID BLUE 29 5850-35-1 C22H14N6Na2O9S2
Acid Red 142 Acid Red 142 6406-66-2 C22H17N4NaO7S2
Acid Scarlet RS Acid Scarlet RS
GERANINE G GERANINE G 8003-84-7 C24H15N3Na2O7S3
Acid Brown 283 Acid Brown 283 12219-66-8
ALPHAZURINE A ALPHAZURINE A 3486-30-4 C37H37N2NaO6S2
Acid Blue 350 Acid Blue 350 138067-74-0
Acid Blue 230 Acid Blue 230 12219-37-3 C24H21N2NaO5S
ACID YELLOW 17 ACID YELLOW 17 6359-98-4 C16H13Cl2N4NaO7S2
ACID RED 13 ACID RED 13 6039-95-8 C20H12N2Na2O7S2
ACID YELLOW 40 ACID YELLOW 40 6372-96-9 C23H19ClN4O7S2.Na
ACID YELLOW 25 (C.I. 18835) ACID YELLOW 25 (C.I. 18835) 6359-85-9 C23H20N5NaO6S2
ACID VIOLET 7 ACID VIOLET 7 4197-09-5 C20H16N4Na2O9S2
ACID RED 114 ACID RED 114 6459-94-5 C37H28N4Na2O10S3
ACID ORANGE 51 ACID ORANGE 51 8003-88-1 C36H26N6Na2O11S3
Acid Red 3GX Acid Red 3GX
ACID BLUE 15 ACID BLUE 15 5863-46-7 C42H46N3NaO6S2
Neutral Red 2gl Neutral Red 2gl 12239-05-3 C17H14IN5O4S
Acid Orange  56 Acid Orange 56 6470-20-8 C32H22N6Na2O8S2
Acid Red 154 Acid Red 154 6507-79-5 C40H34N4Na2O10S2
Acid Yellow 199 Acid Yellow 199 70865-20-2 C19H15N4NaO6S
249 ACID RED 249 249 ACID RED 249
Acid Orange  89 Acid Orange 89 12269-95-3 C32H22N10O8.Cr.Na
Acid Yellow 128 Acid Yellow 128 51053-43-1 C16H16N4O5S
Acid Turquoise Blue Acid Turquoise Blue
ACID BLUE 92 ACID BLUE 92 3861-73-2 C26H20N3NaO10S3
Acid Violet 43 Acid Violet 43 4430-18-6 C21H16NNaO6S
Acid Violet 49 Acid Violet 49 1694-09-3 C39H42N3NaO6S2
Acid black 29 Acid black 29 12217-14-0
Acid Yellow  61 Acid Yellow 61 12217-38-8 C24H22Cl2N5NaO6S2
Acid Yellow  79 Acid Yellow 79 12220-70-1 C47H40N10Na2O12S4
Acid Red 186 Acid Red 186 52677-44-8 C20H12CrN4NaO8S2
Acid Brown 348 Acid Brown 348 72827-72-6
ACID BLACK NT ACID BLACK NT
Acid Yellow 220 Acid Yellow 220 71603-79-7 C24H18IN4NaO7S
Acid Brown 440 Acid Brown 440 93376-15-9 C34H25N8NaO14S3
CROCEIN SCARLET 7B CROCEIN SCARLET 7B 6226-76-2 C24H18N4Na2O7S2
SOLWAY BLUE RN SOLWAY BLUE RN 4403-89-8 C22H19N2NaO5S
VITAMIN FOLIC ACID ASSAY MEDIUM VITAMIN FOLIC ACID ASSAY MEDIUM
Acid Red  57 Acid Red 57 12217-34-4 C24H22N4O6S2
Acid Brown 282 Acid Brown 282 12219-65-7
Acid Red 336 Acid Red 336 12239-11-1
Acid Brown 161 Acid Brown 161 61724-13-8
Acid Green 73 Acid Green 73 12219-93-1
Acid Blue 168 Acid Blue 168 12219-24-8 C20H15CuN5O5S
Acid Brown 163 Acid Brown 163
ACID BLACK 48 ACID BLACK 48 1328-24-1 C28H18N3NaO7S
Acid Yellow 110 Acid Yellow 110 12220-74-5
Neutral Brown Rl Neutral Brown Rl 12238-94-7 C15H14O5
disodium 6-amino-4-hydroxy-5-[(4-nitro-2-sulphonatophenyl)azo]naphthalene-2-sulphonate disodium 6-amino-4-hydroxy-5-[(4-nitro-2-sulphonatophenyl)azo]naphthalene-2-sulphonate 6441-91-4 C16H10N4Na2O9S2
Week Acid Dyes Week Acid Dyes
C.I.Acid Yellow 23 C.I.Acid Yellow 23
sodium 4-hydroxy-5-[(2-methoxy-4-nitrophenyl)azo]-6-(phenylamino)naphthalene-2-sulphonate sodium 4-hydroxy-5-[(2-methoxy-4-nitrophenyl)azo]-6-(phenylamino)naphthalene-2-sulphonate 6222-55-5 C23H17N4NaO7S
sodium 6-amino-4-hydroxy-5-[[2-(trifluoromethyl)phenyl]azo]naphthalene-2-sulphonate sodium 6-amino-4-hydroxy-5-[[2-(trifluoromethyl)phenyl]azo]naphthalene-2-sulphonate 67786-14-5 C17H13F3N3NaO4S
Acid Orange  86 Acid Orange 86 12220-07-4
Acid Orange 127 Acid Orange 127 12269-96-4 C24H19N4NaO4S
Acid Yellow RXL Acid Yellow RXL
Acid Brown 365 Acid Brown 365 63641-88-3
Acid Brown 191 Acid Brown 191 61724-16-1
C.I.Acid Brown 37 C.I.Acid Brown 37
ACID BLUE 41 ACID BLUE 41 2666-17-3 C23H20N3NaO6S
ACID BLUE 158 ACID BLUE 158 C20H12N2Na2O8S2
disodium 4-[[2,4-dihydroxy-3-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-1-sulphonate disodium 4-[[2,4-dihydroxy-3-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-1-sulphonate 5850-15-7 C22H14N4Na2O8S2
sodium 5-[(2-hydroxynaphthyl)azo]naphthalenesulphonate sodium 5-[(2-hydroxynaphthyl)azo]naphthalenesulphonate 5850-93-1 C20H13N2NaO4S
sodium 3-[[4-(benzoylethylamino)-2-methylphenyl]azo]-4-hydroxynaphthalene-1-sulphonate sodium 3-[[4-(benzoylethylamino)-2-methylphenyl]azo]-4-hydroxynaphthalene-1-sulphonate 6245-59-6 C26H24N3NaO5S
Acid Violet 109 Acid Violet 109 12220-63-2
ACID BROWN 422 ACID BROWN 422 126851-39-6
Acid Blue 182 Acid Blue 182 12219-26-0 C23H17N3O9S2·2Na
C.I.Acid Red 337 C.I.Acid Red 337 C17H11F3N3NaO4S
ACID DYES ACID DYES
Acid Orange  95 Acid Orange 95 12217-33-3
Acid Black  60 Acid Black 60 12218-95-0 C38H33CrN8O10S2
Acid Red 226 Acid Red 226 12269-99-7 C32H22N10O8.Cr.Na
Acid Orange 171 Acid Orange 171
Acid Brown  98 Acid Brown 98 12269-88-4 C48H39FeN15O21S3
ACID BLUE 82 ACID BLUE 82 12217-19-5
C.I.Acid Brown 75 C.I.Acid Brown 75
ACID BLACK 24 ACID BLACK 24 3071-73-6 C36H26N5NaO6S2
ACID YELLOW 14 (C.I. 18960) ACID YELLOW 14 (C.I. 18960) 6359-97-3 C16H13Cl2N4NaO4S
Acid Blue 277 Acid Blue 277 25797-81-3 C24H24N3NaO8S2
Acid Yellow 127 Acid Yellow 127 73384-78-8 C26H20Cl2N9NaO4S
disodium 4,4'-[methylenebis(4,1-phenyleneimino)]bis[1-amino-9,10-dihydro-9,10-dioxoanthracene-2-sulphonate] disodium 4,4'-[methylenebis(4,1-phenyleneimino)]bis[1-amino-9,10-dihydro-9,10-dioxoanthracene-2-sulphonate] 25826-34-0 C41H29N4NaO10S2
Acid Brown  58 Acid Brown 58 12269-87-3
Acid Brown 215 Acid Brown 215
Acid Brilliant Blue RL Acid Brilliant Blue RL
Acid dyestuff levelling agent Acid dyestuff levelling agent
ACID BLACK 52 ACID BLACK 52 5610-64-0 C60H36Cr2N9Na3O21S3
Acid Red 213 Acid Red 213 12715-60-5 C16H13N3O4S
214 ACID BROWN 214 214 ACID BROWN 214
ACID RED 8 ACID RED 8 4787-93-3 C18H17N2NaO7S2
Acid Orange 3RL Acid Orange 3RL
ACID BLUE 25 ACID BLUE 25 6408-78-2 C20H13N2NaO5S
Acid Blue BGA Acid Blue BGA
Acid Yellow 2GL Acid Yellow 2GL
ACID BLUE 40 ACID BLUE 40 6424-85-7 C22H16N3NaO6S
Acid Red 137 Acid Red 137 6222-63-5 C20H18N4O6S.Na
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