Red 33

Red 33 is classified chemically as a monoazo color. It conforms to the formula: C16H13N3O7S2 • 2Na.
CAS Numbers:
  • 3567-66-6
Technical Names:
  • 2,7-Naphthalenedisulfonic acid, 5-Amino-4-Hydroxy-3-(2-Phenyldiazenyl)-, Sodium Salt (1:2)
  • 2,7-Naphthalenedisulfonic Acid, 5-Amino-4-Hydroxy-3-(Phenylazo)-, Disodium Salt
  • 5-Amino-4-Hydroxy-3-(Phenylazo)-2,7-Naphthalenedisulfonic Acid, Disodium Salt
  • Acid Red 33 (INCI)
  • Acid Red 33, Disodium Salt
  • Azo Fuchsine
  • Azofuchsin
  • CI 17200 (INCI)
  • D&C Red No. 33 (should be used only if batch certified by the U.S. Food and Drug Administration)
  • Disodium 1-Hydroxy-2-Phenylazo-8-Aminonaphthalene-3,6-Disulfonate
  • Red 33 (INCI)
  • Red No. 227
Product Categories:
  • Cleaning Products
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