Direct Red 88
Name:C.I.Direct Red 88,C.I.22360
Molecular Structure: Double azo class
C.I.Direct Red 88,C.I.22360,CAS 6459-86-5,669.57,C31H21N5Na2O8S
Molecular Formula:C31H21N5Na2O8S
Molecular Weight: 669.57
CAS Registry Number:6459-86-5
Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, respectively with 2-Hydroxybenzoic acid and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.
Properties and Applications: dark red red to blue light. Soluble in water is cherry red. The strong sulfuric acid for dark red light purple, diluted for brown. The dye solution to join strong hydrochloric acid have brown light purple precipitation; Add thick sodium hydroxide solution for red light brown, a brick red precipitate
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 4-5 | 3-4 | 3-4 | 3 | 2-3 | ||
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