Uses
Acid Red 4 is an azo dye. The wavelength of maximum absorbance for Acid Red 4 is 508 nm[1].
Preparation
p-Anisidine diazo, coupled with the 4-Hydroxynaphthalene-1-sulfonic acid.
Definition
ChEBI: An organic sodium salt having 4-hydroxy-3-[(2-methoxyphenyl)diazenyl]naphthalene-1-sulfonate as the counterion.
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.
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Standard
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Light Fastness
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Soaping
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Persperation Fastness
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Oxygen bleaching
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Fastness to seawater
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Fading
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Stain
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Fading
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Stain
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Fading
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Stain
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ISO
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5
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2-3
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2-3
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2-3
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AATCC
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4
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1
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3
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1
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1
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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
