Acid red 97 (c.i. 22890)

Soluble in water is orange-red, soluble in ethanol is orange, soluble in acetone and ethylene glycol ethyl ether. Its aqueous solution produces a reddish brown precipitate when added to concentrated hydrochloric acid; reddish orange-brown when added to concentrated sodium hydroxide solution. The dye is reddish purple in concentrated sulfuric acid, and dark peach when diluted; in concentrated nitric acid it is dark bluish red, and then changes to orange.

Acid Red 97 is an organic azo dye used as a leather dye, and in the preparation of fluorescent inorganic-organic hybrid nanoparticles for staining and imaging.

Red to dark red powder. Copper and iron dull color; iron to a greater extent.

Azo dyes in powder form can be explosive when suspended in air at specific concentrations. Moderately soluble in water to give acidic solution.

Aqueous solutions react as acids to neutralize bases in weakly exothermic reactions. Toxic gases are formed by mixing 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.

ACUTE/CHRONIC HAZARDS: When heated to decomposition ACID RED 97 (C.I. 22890) emits toxic fumes of nitrogen oxides.

Flash point data for ACID RED 97 (C.I. 22890) are not available; however, ACID RED 97 (C.I. 22890) is probably combustible.

Not classified