Anti-Reducing Agent for Printing (Sodium m-Nitrobenzenesulfonate)
Sodium m-nitrobenzenesulfonate (Ludigol/Resist Salt L) is an oxidizing anti-reducing agent added to reactive and acid dye printing pastes to prevent premature dye reduction during high-temperature steaming fixation. It oxidizes any reducing agents present in the steamer atmosphere, protecting dye color integrity and yield. Essential in cotton printing production for consistent bright shades.
Technical Specifications
| appearance | White to light yellow crystalline powder |
| purity (%) | ≥98 |
| solubility | Freely soluble in water |
| moisture (%) | ≤1 |
| pH (1% solution) | 6–7 |
| active content (%) | ≥98 |
Applications
- Protective anti-reducing agent in reactive dye printing on cotton
- Acid dye steaming prints on silk and wool
- Preventing color loss in vat dye prints during steaming
- Discharge printing protection for ground color
- Combined reactive-pigment printing formulations
Key Features
- Prevents color yield loss of up to 20–30% caused by reduction in steaming
- Effective at low dosages (5–15 g/kg paste) for economical use
- Compatible with all reactive dye print paste components
- Does not affect shade or dye fixation rate on the fiber
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