CI 23790

Preparation

3,3′-Dimethylbenzidine double nitriding, and 4,5-Dihydroxynaphthalene-2,7-disulfonic acid (2 Moore) coupled.

General Description

Deep purple-blue powder.

Air & Water Reactions

Azo dyes can be explosive when suspended in air at specific concentrations. Slightly water soluble.

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.

Fire Hazard

Flash point data for CI 23790 are not available; CI 23790 is probably combustible.

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.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	5	3-4	2	1-2		1-2
AATCC	5	2	1-2	1		1