C.I. Direct Yellow 21
- CAS NO.：1325-46-8
- Molecular Weight: 0
- EINECS: 603-622-6
What is C.I. Direct Yellow 21?
Preparation
(E)-2-(2-sulfo-4-nitrostyryl)-5-nitrobenzenesulfonic acid sodium sodium hydroxide solution together with aniline backflow heating.
Properties and Applications
soluble in water to pure yellow, slightly soluble in ethanol for yellow. The strong sulfuric acid in red orange for, for the yellow brown after diluted, precipitation. The dye solution to join a light yellow brown hydrochloric acid precipitation; Add sodium hydroxide have orange precipitation.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 5 | 3 | 2 | 3 | 3-4 | ||
Safety information for C.I. Direct Yellow 21
New Products
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