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ACID RED 4

CAS No.
5858-39-9
Chemical Name:
ACID RED 4
Synonyms
Pink B;CI 14710;AZO EOSIN;ACID RED 4;Azo Eosine G;C.I. Acid Red 4;Acid Red 4 (C.I.);acidred4(c.i.14710);AZOEOSIN C.I. NO. 14710;Metamine Fast Acid Red N
CBNumber:
CB5169843
Molecular Formula:
C17H13N2NaO5S
Molecular Weight:
380.35
MDL Number:
MFCD00003939
MOL File:
5858-39-9.mol
MSDS File:
SDS
Last updated:2026-05-20 15:44:38
Product description Number Pack Size Price
ACID RED 4 (FAST ACID RED E C.I. 14710) AldrichCPR R324272 1 unit $197
ACID RED 4 (FAST ACID RED E C.I. 14710) AldrichCPR R324272 1G $179
Acid Red 4 44621 1g $52
Acid Red 4 44621 5g $143
Acid Red 4 44621 10g $260
More product size

ACID RED 4 Properties

Melting point >210°C(dec.)
storage temp. Amber Vial, Refrigerator, Under inert atmosphere
solubility Methanol (Slightly)
form Solid
color Red
EPA Substance Registry System C.I. Acid Red 4, monosodium salt (5858-39-9)

SAFETY

Risk and Safety Statements

WGK Germany  3
TSCA  TSCA listed

ACID RED 4 price

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich R324272 ACID RED 4 (FAST ACID RED E C.I. 14710) AldrichCPR 5858-39-9 1 unit $197 2026-04-30 Buy
Sigma-Aldrich R324272 ACID RED 4 (FAST ACID RED E C.I. 14710) AldrichCPR 5858-39-9 1G $179 2024-03-01 Buy
Cayman Chemical 44621 Acid Red 4 5858-39-9 1g $52 2026-04-30 Buy
Cayman Chemical 44621 Acid Red 4 5858-39-9 5g $143 2026-04-30 Buy
Cayman Chemical 44621 Acid Red 4 5858-39-9 10g $260 2026-04-30 Buy
Product number Packaging Price Buy
R324272 1 unit $197 Buy
R324272 1G $179 Buy
44621 1g $52 Buy
44621 5g $143 Buy
44621 10g $260 Buy

ACID RED 4 Chemical Properties,Uses,Production

Uses

Acid Red 4 is an azo dye. The wavelength of maximum absorbance for Acid Red 4 is 508 nm[1].

Definition

ChEBI: An organic sodium salt having 4-hydroxy-3-[(2-methoxyphenyl)diazenyl]naphthalene-1-sulfonate as the counterion.

Preparation

p-Anisidine diazo, coupled with the 4-Hydroxynaphthalene-1-sulfonic acid.

Properties and Applications

red. Soluble in water for red, soluble in acetone, slightly soluble in ethanol (orange) and toluene. The strong sulfuric acid to red light purple, diluted red for quality. In water solution to join strong hydrochloric acid have dark red precipitate; Add nitric acid have blue-ray red precipitation, first into a brown, then yellow; Add thick sodium hydroxide solution color change.

Standard Light Fastness Soaping Persperation Fastness Oxygen bleaching Fastness to seawater
Fading Stain Fading Stain Fading Stain
ISO 5 2-3 2-3 2-3
AATCC 4 1 3 1 1

References

[1] M F Coughlin, et al. Degradation of azo dyes containing aminonaphthol by Sphingomonas sp strain 1CX. J Ind Microbiol Biotechnol. 1999 Oct;23(4-5):341-346. DOI:10.1038/sj.jim.2900746

ACID RED 4 Preparation Products And Raw materials

Raw materials

Preparation Products

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1-Naphthalenesulfonicacid,4-hydroxy-3-[(2-methoxyphenyl)azo]-,monosodiumsalt 4-hydroxy-3-[(2-methoxyphenyl)azo]-1-naphthalenesulfonicacimonosodiumsal acidred4(c.i.14710) ACID RED 4 CI 14710 AZO EOSIN Acid Red 4 (C.I.) C.I. Acid Red 4 sodium 4-hydroxy-3-(2-methoxyphenylazo)naphthalenesulphonate 3-(2-Methoxyphenylazo)-4-hydroxynaphthalene-1-sulfonic acid sodium salt 4-Hydroxy-3-[(2-methoxyphenyl)azo]-1-naphthalenesulfonic acid sodium salt Azo Eosine G AZOEOSIN C.I. NO. 14710 Metamine Fast Acid Red N Pink B Azoeosin C.I. No. 14710 (Technical Grade) C.I.Acid Red 4:C.I.14710 ACID RED 4 (FAST ACID RED E C.I. 14710) C.I. Acid Red 4 (Standard) 5858-39-9 5858-39-3 C17H13N2O5SNa C17H13N2NaO5S C17H14N2O5SNa Organics