| Solubility (g/L) | Light fastness | Washing fastness | Resistance to sweat stains (alkali) |
Rubbing fastness | Heat resistance |
|---|---|---|---|---|---|
| （50ºC） | （Xenon Lamp）（1/1） | （CO/CH） | （Alkali） | （Dry/Wet） | （Dry/Wet） |
| 60-90 | 4-5 | 3-4， 4 | 4 | 4 ，2-3 | 4 ，3 |
C.I. Reactive Blue 21 is a classic navy blue dye with outstanding cost-effectiveness and balanced comprehensive performance. It has reliable performance in fixation rate, build-up power and conventional fastness, making it an economical and practical choice for producing conventional medium to dark color cellulosic fiber textiles.
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