C.I. Direct Red 216
- CAS NO.：8004-49-7
- Molecular Weight: 0
- EINECS: 616-833-3
What is C.I. Direct Red 216?
Preparation
mixed N,N-dimethylaniline diazo, and 7-(4-Aminobenzamido)-4-hydroxynaphthalene-2-sulfonic acid coupling.
Properties and Applications
colourful red yellow light. Soluble in water for orange red to red, soluble in ethanol is palm light orange. The strong sulfuric acid for product red to red light purple, diluted in red. The dye solution to join strong hydrochloric acid have red precipitate; With sodium hydroxide have orange brown precipitation.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 5 | 4 | 2 | 3-4 | 4 | ||
Safety information for C.I. Direct Red 216
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