Sulphur Blue 7

Sulphur Blue 7 is Blue powder. In the water have certain solubility. In concentrated sulfuric acid to dark purple, and Sulfur dioxide escaping, dilute precipitate; In the Sodium hydroxide solution for blue; In the Sodium sulfide solution for the faint blue or olive. Dyeing content in alkaline insurance powder solution for the pale yellow light olive, after oxidation can restore the original colour and lustre; In Sodium hypochlorite solution completely fade. Available insurance powder dyeing.

Relative name

Sulphur Blue BRN;Solubilised Sulphur Blue B;Solubilised Sulphur Blue BRN;

Technical & Application Notes

Sulfur dyes require a two-stage approach: reduction to the soluble leuco form, exhaustion onto the fiber, then careful oxidation to regenerate the insoluble dye inside the fiber matrix. Correct control of reduction level and oxidation ensures optimal wash and rub fastness.

Suggested industrial workflow (reference)

• Pre-wet goods and adjust liquor ratio per mill practice.
• Reduce the sulfur dye to its leuco form using suitable reducing agents under alkaline conditions.
• Exhaust reduced dye onto goods with uniform agitation.
• Oxidize completely (air or controlled oxidizer), followed by rinsing and neutralization.

Lead time & supply

Regional stock available — contact sales for current lead times and bulk pricing.

Troubleshooting

• Patchy dyeing: check mechanical circulation and reduction uniformity.
• Faded shades after wash: ensure oxidation step is complete; consider post-fix or improving rinsing.
• High deposits: optimize reducing agent dosage and ensure sufficient wetting agents/dispersants.

Applications:

Sulphur Blue 7 Mainly used for cotton, hemp, viscose fabric dyeing, and can also be used to top and viscose fiber protoplasmic coloring. Sometimes also used in leather and paper dyeing.

Technical Specifications

• ‍Product Name: Sulphur Blue 7
• C.I. No.: 53441
• CAS No.: 1332-88-3
• Shade: Red light blue to blue light purple.‍

Package

25KG/DRUM, CARTON BOX, BAG

Note: The data contained here are based on our current knowledge and experience. It is the responsibility of user to test our products before the final application.