Preparation
3,3′-Dimethylbenzidine double nitriding, and 4,5-Dihydroxynaphthalene-2,7-disulfonic acid (2 Moore) coupled.
Reactivity Profile
CI 23790 is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. Cleavage of the diazo group by reducing agents may lead to benzidine production.
Properties and Applications
blue. Soluble in water for blue, insoluble in other organic solvents. The strong sulfuric acid for green light blue, diluted into red light blue and purple; In nitric acid solution for red, and then into a yellow light brown. The dye solution to join strong hydrochloric acid for red light blue; Add thick sodium hydroxide solution for black and blue. Used for cellulose fiber dyeing and printing of, also used for paper color.
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Standard
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Acid Resistance
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Alkali Resistance
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Light Fastness
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Soaping
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Water
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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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3-4
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2
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1-2
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1-2
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AATCC
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5
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2
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1-2
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1
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1
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