Date published: 2026-5-31

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Pigment Red 63:1 (CAS 6417-83-0)

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Alternate Names:
3-hydroxy-4-(1-sulfo-2-naphthalenyl)azo-2-Naphthalenecarboxylic acid calcium salt (1:1)
CAS Number:
6417-83-0
Molecular Weight:
460.47
Molecular Formula:
C21H12CaN2O6S
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Pigment Red 63:1 also known as CI Red No. 34 or Acid Red 87, is a red colorant that may be used across various industries. As a monoazo dye, it offers a vibrant red hue, remarkable stability, and cost-effectiveness. Pigment Red 63:1 a monoazo dye, owes its brilliant red color to its capacity to absorb visible light. Following ingestion, this colorant undergoes rapid absorption within the gastrointestinal tract and subsequently distributes to various tissues. Metabolism takes place through liver enzymes, with eventual excretion occurring in the urine, although the precise mechanism of action remains unclear.


Pigment Red 63:1 (CAS 6417-83-0) References

  1. Ultra-performance liquid chromatographic determination of manufacturing intermediates and subsidiary colors in D&C Red No. 34 and its lakes.  |  Harp, BP., et al. 2011. J AOAC Int. 94: 1548-54. PMID: 22165019
  2. Comprehensive screening of 63 coloring agents in cosmetics using matrix solid-phase dispersion and ultra-high-performance liquid chromatography coupled with quadrupole-Orbitrap high-resolution mass spectrometry.  |  Chen, M., et al. 2019. J Chromatogr A. 1590: 27-38. PMID: 30630619

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Pigment Red 63:1, 1 g

sc-495828
1 g
$150.00