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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:Acid Orange 7
  • CAS:633-96-5
  • MF:C16H11N2NaO4S

  • Structure:
  • Chemical Name:Tartrazine
  • CAS:1934-21-0
  • MF:C16H9N4Na3O9S2

  • Structure:
  • Chemical Name:Acid Brown 14
  • CAS:5850-16-8
  • MF:C26H16N4Na2O8S2

  • Structure:
  • Chemical Name:Acid Red 87
  • CAS:548-26-5
  • MF:C20H6Br4Na2O5

  • Structure:
  • Chemical Name:Acid Red 27
  • CAS:915-67-3
  • MF:C20H11N2Na3O10S3

  • Structure:
  • Chemical Name:Acid Blue 119
  • CAS:1324-80-7
  • MF:C21H14NNaO6S

  • Structure:
  • Chemical Name:Fuchsin Acid
  • CAS:3244-88-0
  • MF:C20H17N3Na2O9S3


  • Structure:
  • Chemical Name:ACID BLUE 113
  • CAS:3351-05-1
  • MF:C32H21N5Na2O6S2

  • Structure:
  • Chemical Name:Acid Green 50
  • CAS:3087-16-9
  • MF:C27H25N2NaO7S2

  • Structure:
  • Chemical Name:Acid Green 25
  • CAS:4403-90-1
  • MF:C28H20N2Na2O8S2

  • Structure:
  • Chemical Name:ACID RED 88
  • CAS:1658-56-6
  • MF:C20H13N2NaO4S

  • Structure:
  • Chemical Name:ACID RED 151
  • CAS:6406-56-0
  • MF:C22H15N4NaO4S

  • Structure:
  • Chemical Name:Acid blue 1
  • CAS:129-17-9
  • MF:C27H31N2NaO6S2

  • Structure:
  • Chemical Name:Acid Orange 10
  • CAS:1936-15-8
  • MF:C16H10N2Na2O7S2

  • Structure:
  • Chemical Name:ORANGE I
  • CAS:523-44-4
  • MF:C16H11N2NaO4S

  • Structure:
  • Chemical Name:Acid Red 92
  • CAS:18472-87-2
  • MF:C20H2Br4Cl4Na2O5

  • Structure:
  • Chemical Name:Acid Green 1
  • CAS:19381-50-1
  • MF:C30H15FeN3Na3O15S3

  • Structure:
  • Chemical Name:METANIL YELLOW
  • CAS:587-98-4
  • MF:C18H14N3NaO3S

  • Structure:
  • Chemical Name:Acid Blue 129
  • CAS:6397-02-0
  • MF:C23H19N2NaO5S


  • Structure:
  • Chemical Name:Direct Black GB
  • CAS:12220-20-1
  • MF:C31H25N5Na2O6S2

  • Structure:
  • Chemical Name:Tracid Red Bs
  • CAS:15792-43-5
  • MF:C30H37N3Na2O8S2



  • Chemical Name:Acid Black 168
  • CAS:12238-87-8
  • MF:[C38H23N6O10S.Cr.2Na]; [C36H20N5O9S.Cr.2Na]

  • Structure:
  • Chemical Name:Acid Black 1
  • CAS:1064-48-8
  • MF:C22H14N6Na2O9S2


  • Structure:
  • Chemical Name:Acid Blue 83
  • CAS:6104-59-2
  • MF:C45H44N3NaO7S2

  • Structure:
  • Chemical Name:Acid Violet 17
  • CAS:4129-84-4
  • MF:C41H44N3NaO6S2

  • Structure:
  • Chemical Name:CI 63010
  • CAS:2861-02-1
  • MF:C14H8N2Na2O10S2


  • Structure:
  • Chemical Name:Acid Yellow 49
  • CAS:12239-15-5
  • MF:C16H13Cl2N5O3S

  • Structure:
  • Chemical Name:Acid Black 234
  • CAS:157577-99-6
  • MF:C34H26N10Na2O9S3




  • Structure:
  • Chemical Name:Acid Blue 90
  • CAS:6104-58-1
  • MF:C47H48N3NaO7S2

  • Structure:
  • Chemical Name:Aniline Blue
  • CAS:28631-66-5
  • MF:C32H25N3Na2O9S3

  • Structure:
  • Chemical Name:ACID GREEN 41
  • CAS:4430-16-4
  • MF:C28H20N2Na2O10S2

  • Structure:
  • Chemical Name:ACID RED 13
  • CAS:2302-96-7
  • MF:C20H12N2Na2O7S2

  • Structure:
  • Chemical Name:ACID BLUE 1
  • CAS:116-95-0
  • MF:C27H31N2NaO6S2


  • Structure:
  • Chemical Name:ACID VIOLET 7
  • CAS:4321-69-1
  • MF:C20H16N4Na2O9S2

  • Structure:
  • Chemical Name:Acid Red 18
  • CAS:2611-82-7
  • MF:C20H11N2Na3O10S3


  • Structure:
  • Chemical Name:Orange IV
  • CAS:554-73-4
  • MF:C18H14N3NaO3S


  • Structure:
  • Chemical Name:Acid Red 94
  • CAS:632-69-9
  • MF:C20H2Cl4I4Na2O5

  • Structure:
  • Chemical Name:ACID BLUE 120
  • CAS:3529-01-9
  • MF:C33H23N5Na2O6S2

  • Structure:
  • Chemical Name:ORANGE G
  • CAS:1936-96-5
  • MF:C16H10N2Na2O7S2

  • Structure:
  • Chemical Name:CI 13015
  • CAS:2706-28-7
  • MF:C12H9N3Na2O6S2

  • Structure:
  • Chemical Name:EOSIN
  • CAS:17372-87-1
  • MF:C20H6Br4Na2O5

  • Structure:
  • Chemical Name:Acid Yellow 220
  • CAS:70851-34-2
  • MF:C46H32Cl2CoN8Na4O14S2

  • Structure:
  • Chemical Name:ACID RED 60
  • CAS:5850-64-6
  • MF:C20H14N2O11S3


  • Structure:
  • Chemical Name:Acid Orange 24
  • CAS:1320-07-6
  • MF:C20H17N4NaO5S

  • Structure:
  • Chemical Name:Acid Orange 67
  • CAS:12220-06-3
  • MF:C26H21N4NaO8S2



  • Structure:
  • Chemical Name:Acid Yellow 4R
  • CAS:12715-61-6
  • MF:C32H30CoN8O10S2


  • Structure:
  • Chemical Name:EOSIN Y
  • CAS:
  • MF:C20H8Br4O5



  • Structure:
  • Chemical Name:ACID RED 106
  • CAS:6844-74-2
  • MF:C23H17N3Na2O9S3

  • Structure:
  • Chemical Name:ACID RED 1
  • CAS:3734-67-6
  • MF:C18H13N3Na2O8S2


  • Structure:
  • Chemical Name:Acid Yellow 42
  • CAS:6375-55-9
  • MF:C32H24N8Na2O8S2





  • Structure:
  • Chemical Name:ACID BLUE 62
  • CAS:4368-56-3
  • MF:C20H20N2O5S

  • Structure:
  • Chemical Name:C.I. 14720
  • CAS:3567-69-9
  • MF:C20H12N2Na2O7S2

  • Structure:
  • Chemical Name:SOLWAY BLUE RN
  • CAS:4403-89-8
  • MF:C22H17N2NaO5S



  • Structure:
  • Chemical Name:Acid Red 57
  • CAS:12217-34-4
  • MF:C24H22N4O6S2








  • Structure:
  • Chemical Name:ACID RED 9
  • CAS:8003-59-6
  • MF:C20H13N2NaO4S


  • Structure:
  • Chemical Name:ACID BLACK 48
  • CAS:1328-24-1
  • MF:C28H18N3NaO7S


  • Structure:
  • Chemical Name:AZOFUCHSIN
  • CAS:3567-66-6
  • MF:C16H11N3Na2O7S2


  • Structure:
  • Chemical Name:Acid Orange 3
  • CAS:6373-74-6
  • MF:C18H13N4NaO7S




  • Structure:
  • Chemical Name:Acid violet 90
  • CAS:6408-29-3
  • MF:C40H27CrN8O10S2.2Na

  • Structure:
  • Chemical Name:Acid Yellow 117
  • CAS:6459-70-7
  • MF:C39H30N8O8S2.2Na

  • Structure:
  • Chemical Name:Acid Brown 75
  • CAS:8011-86-7
  • MF:C10H9NO7S2