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 Orange 7 Acid Orange 7 633-96-5 C16H11N2NaO4S
Tartrazine Tartrazine 1934-21-0 C16H9N4Na3O9S2
Acid Brown 14 Acid Brown 14 5850-16-8 C26H16N4Na2O8S2
Acid Red 87 Acid Red 87 548-26-5 C20H8Br4O5
Acid Red 27 Acid Red 27 915-67-3 C20H11N2Na3O10S3
Acid Blue 119 Acid Blue 119 1324-80-7 C21H14NNaO6S
Fuchsin Acid Fuchsin Acid 3244-88-0 C20H17N3Na2O9S3
LIGHT GREEN SF YELLOWISH LIGHT GREEN SF YELLOWISH 93942-43-9 C37H34N2Na2O9S3
ACID BLUE 113 ACID BLUE 113 3351-05-1 C32H21N5Na2O6S2
Acid Green 50 Acid Green 50 3087-16-9 C27H25N2NaO7S2
Acid Green 25 Acid Green 25 4403-90-1 C28H20N2Na2O8S2
ACID RED 88 ACID RED 88 1658-56-6 C20H13N2NaO4S
ACID RED 151 ACID RED 151 6406-56-0 C22H15N4NaO4S
Acid blue 1 Acid blue 1 129-17-9 C27H31N2NaO6S2
Acid Orange 10 Acid Orange 10 1936-15-8 C16H10N2Na2O7S2
ORANGE I ORANGE I 523-44-4 C16H11N2NaO4S
Acid Red 92 Acid Red 92 18472-87-2 C20H2Br4Cl4Na2O5
Acid Green 1 Acid Green 1 19381-50-1 C30H15FeN3Na3O15S3
METANIL YELLOW METANIL YELLOW 587-98-4 C18H14N3NaO3S
Acid Blue 129 Acid Blue 129 6397-02-0 C23H19N2NaO5S
Xylenol Orange sodium salt Xylenol Orange sodium salt 63721-83-5 C31H31N2NaO13S
Direct Black GB Direct Black GB 12220-20-1 C31H25N5Na2O6S2
Tracid Red Bs Tracid Red Bs 15792-43-5 C30H37N3Na2O8S2
Acid Blue 264 Acid Blue 264 39315-90-7 C29H24N3O7S2.Na
Acid Orange 156 Acid Orange 156 68555-86-2 C21H19N4NaO5S
Acid Black 168 Acid Black 168 12238-87-8 [C38H23N6O10S.Cr.2Na]; [C36H20N5O9S.Cr.2Na]
Acid Black 1 Acid Black 1 1064-48-8 C22H14N6Na2O9S2
AMIDO GREEN BLACK B AMIDO GREEN BLACK B 5850-39-5 C22H16N6Na2O7S2
Acid Blue 83 Acid Blue 83 6104-59-2 C45H44N3NaO7S2
Acid Violet 17 Acid Violet 17 4129-84-4 C41H44N3NaO6S2
CI 63010 CI 63010 2861-02-1 C14H8N2Na2O10S2
ACID RED 97 (C.I. 22890) ACID RED 97 (C.I. 22890) 10169-02-5 C32H20N4Na2O8S2
Acid Yellow  49 Acid Yellow 49 12239-15-5 C16H13Cl2N5O3S
Acid Black 234 Acid Black 234 157577-99-6 C34H26N10Na2O9S3
Tracid Brilliant Red B Tracid Brilliant Red B 6416-66-6 C29H20ClN3Na2O10S3
Acid Black ATT Acid Black ATT
SULFORHODAMINE G SULFORHODAMINE G 5873-16-5 C25H25N2NaO7S2
Acid Blue 90 Acid Blue 90 6104-58-1 C47H48N3NaO7S2
Aniline Blue Aniline Blue 28631-66-5 C32H25N3Na2O9S3
ACID GREEN 41 ACID GREEN 41 4430-16-4 C28H20N2Na2O10S2
ACID RED 13 ACID RED 13 2302-96-7 C20H12N2Na2O7S2
ACID BLUE 1 ACID BLUE 1 116-95-0 C27H31N2NaO6S2
Tracid Brilliant Red 10b Tracid Brilliant Red 10b 11097-74-8 C37H11N3S3O11Na2
ACID VIOLET 7 ACID VIOLET 7 4321-69-1 C20H16N4Na2O9S2
Acid Red 18 Acid Red 18 2611-82-7 C20H11N2Na3O10S3
Acid Orange 24 Acid Orange 24 1320-07-6 C20H17N4NaO5S
Acid chrome blue K Acid chrome blue K 3270-25-5 C16H9N2Na3O12S3
Orange IV Orange IV 554-73-4 C18H14N3NaO3S
Eriochrome Black T Eriochrome Black T 1787-61-7 C20H12N3NaO7S
Acid Red 94 Acid Red 94 632-69-9 C20H2Cl4I4Na2O5
ACID BLUE 120 ACID BLUE 120 3529-01-9 C33H23N5Na2O6S2
ORANGE G ORANGE G 1936-96-5 C16H10N2Na2O7S2
CI 13015 CI 13015 2706-28-7 C12H9N3Na2O6S2
Acid Red 87 Acid Red 87 17372-87-1 C20H6Br4Na2O5
ACID RED 60 ACID RED 60 5850-64-6 C20H14N2O11S3
Tracid Rubine 5bl Tracid Rubine 5bl 12220-29-0 C26H24N5O5S.Na
Acid Orange 67 Acid Orange 67 12220-06-3 C26H21N4NaO8S2
Acid Yellow 116 Acid Yellow 116 12239-18-8 C217H15IN4O5S
Acid Red 131 Acid Red 131 12234-99-0
Acid Yellow 4R Acid Yellow 4R 12715-61-6 C32H30CoN8O10S2
SULFORHODAMINE B SULFORHODAMINE B 3520-42-1 C27H29N2NaO7S2
EOSIN Y EOSIN Y C20H8Br4O5
Acid Yellow 219 Acid Yellow 219 71819-57-3 C20H17N4NaO5S
Acid Black 172 Acid Black 172 61847-77-6 C40H20CrN6Na3O14S2
ACID RED 106 ACID RED 106 6844-74-2 C23H17N3Na2O9S3
ACID RED 1 ACID RED 1 3734-67-6 C18H13N3Na2O8S2
ACID BLACK NT ACID BLACK NT
Acid Yellow 42 Acid Yellow 42 6375-55-9 C32H24N8Na2O8S2
Acid Yellow 220 Acid Yellow 220 71603-79-7 C24H18IN4NaO7S
Acid Brown 440 Acid Brown 440 93376-15-9 C34H21N8Na3O14S3
CROCEIN SCARLET 7B CROCEIN SCARLET 7B 6226-76-2 C24H18N4Na2O7S2
AMMONIUM HYDROGEN TARTRATE AMMONIUM HYDROGEN TARTRATE 3095-65-6 C4H9NO6
ACID BLUE 62 ACID BLUE 62 4368-56-3 C20H20N2O5S
C.I. 14720 C.I. 14720 3567-69-9 C20H12N2Na2O7S2
SOLWAY BLUE RN SOLWAY BLUE RN 4403-89-8 C22H17N2NaO5S
VITAMIN FOLIC ACID ASSAY MEDIUM VITAMIN FOLIC ACID ASSAY MEDIUM
Zirconium oxide sulfate Zirconium oxide sulfate 62010-10-0 O5SZr
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 349 Acid Brown 349 72827-73-7
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 Brown 165 Acid Brown 165 61724-14-9
ACID RED 9 ACID RED 9 8003-59-6 C20H13N2NaO4S
ALIZARIN ASTROL ALIZARIN ASTROL 6408-51-1 C22H17N2NaO5S
ACID BLACK 48 ACID BLACK 48 1328-24-1 C28H18N3NaO7S
ACID GREEN 27 (C.I. 61580) ACID GREEN 27 (C.I. 61580) 6408-57-7 C34H32N2O8S2.2Na
AZOFUCHSIN AZOFUCHSIN 3567-66-6 C16H11N3Na2O7S2
Acid Black 2 Acid Black 2 8005-03-6 NULL
Acid Orange 3 Acid Orange 3 6373-74-6 C18H13N4NaO7S
Acid Yellow 110 Acid Yellow 110 12220-74-5
Neutral Brown Rl Neutral Brown Rl 12238-94-7 C15H14O5
Acid Red 361 Acid Red 361 61931-22-4
Acid violet  90 Acid violet 90 6408-29-3 C40H27CrN8O10S2.2Na
Acid Yellow 117 Acid Yellow 117 6459-70-7 C39H30N8O8S2.2Na
Acid Brown 75 Acid Brown 75 8011-86-7 C10H9NO7S2
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
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