Aluminum, 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex

Uses

Pigment Red 273 is used as a food dye.

Preparation

4-Amino-5-methoxy-2-methylbenzenesulfonic acid diazo, and 6-Hydroxynaphthalene-2-sulfonic acid coupling, and then into aluminum salt deposit color.

Flammability and Explosibility

Not classified

Properties and Applications

yellow light red. Orange red fine powder, odourless. Hardly soluble in water, oil and most solvent, but can be scattered, mixed with water, oil liquid and solid powder. Resistance to light sex, salt tolerance, sex, heat resistance is strong, have certain resistance of acid, alkali resistance. This product is suitable for oil products, powder of solid and colloid water-soluble colorants are difficult to use items shading, color is gorgeous. The product is made of a certain amount of strong HCL, added with a certain volume of two potassium hydrogen sulfate solution diluted, the maximum absorption wavelength for 499 + 2 nm.