Name:C.I.Direct Red 185,C.I.21610
Molecular Structure: Double azo class
Molecular Weight: 502.37
CAS Registry Number:6374-09-0
Manufacturing Methods : 3-(4-Amino-2-sulfophenylamino)-2,3-dioxopropanoic acid diazo, coupled with 2-Hydroxybenzoic acid, grass acid base hydrolysis, again diazo, Coupled with resorcinol.
Properties and Applications: dark red to red light brown. Soluble in water for orange brown, slightly soluble in alcohol. The strong sulfuric acid for purple, diluted shallow orange for brown. The dye solution to join strong hydrochloric acid have orange brown precipitation; Add thick sodium hydroxide solution for dark purple.
List of Suppliers:
Chrome Soga Red 29426( Bayer Group )