ACID RED 4
- CAS NO.：5858-39-9
- Empirical Formula: C17H14N2O5S.Na
- Molecular Weight: 381.36
- MDL number: MFCD00003939
- EINECS: 227-490-0
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-20 15:44:38
What is ACID RED 4?
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 | |||
Properties of ACID RED 4
| 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 information for ACID RED 4
Computed Descriptors for ACID RED 4
ACID RED 4 manufacturer
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