| 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） |
| 70-100 | 5-6 | 4，4-5 | 4-5 | 4-5，3-4 | 4，3-4 |
C.I. Reactive Blue 221 is a high-performance navy blue dye with balanced comprehensive performance and good process friendliness. It has achieved an optimal combination between high light fastness, good wet rubbing performance, high fixation rate and ease of use. It is suitable for producing dark color cellulosic fiber textiles with high durability requirements and is one of the reliable choices in the mid-to- high-end outdoor, workwear and home textile fields.
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