Chemical Properties
dark green to dark purple crystalline powder
Uses
As a dye; as a reagent for boric acid or borates.
Uses
Chromotrope 2B is a chromotropic acid azo dye and a groundwater pollutant removed from the environment via photoelectrochemical mineralization.
Preparation
4-Nitrobenzenamine diazo, and 4,5-Dihydroxynaphthalene-2,7-disulfonic acidcoupling.
Properties and Applications
blue-ray red. Soluble in water for yellow light red, not soluble in alcohol. The strong sulfuric acid for dark purple, diluted into yellow light red solution. In water solution to join hydrochloric acid solution to become yellow, add sodium hydroxide for blue-ray red.
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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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6-7
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4
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4
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4-5
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