Description

Sulphur Black 1 -Solubilised is a water-soluble, pre-reduced form of Sulphur Black 1, a classic sulfur dye. This solubilised variant is critical for industrial applications requiring ease of handling, consistent color yield, and improved process control. It is primarily used by manufacturers in the textile and leather industries for dyeing cellulosic fibers, such as cotton and viscose, to achieve deep, economical black shades with good wash and light fastness.

Application

• Textile Dyeing: Primary application for dyeing cotton, rayon, hemp, and other cellulosic fabrics to produce deep black and navy shades.
• Leather Finishing: Used in the dyeing of leather goods, providing economical and fast black coloration.
• Paper Coloration: Employed for tinting certain types of paper where a cost-effective black colorant is required.
• Batch Dyeing Processes: Well-suited for exhaust dyeing methods in winches, jigs, and becks due to its solubilised nature.
• Union Dyeing: Can be used in processes for dyeing blends containing cellulosic fibers.
• Continuous Dyeing Systems: Applicable in pad-steam or pad-batch continuous dyeing ranges for high-volume production.

Basic Information

Product Name	Sulphur Black 1 -Solubilised
CAS No.	1326-83-6
Molecular Formula	C22H16N6Na4O13S5
Molecular Weight	882.70 g/mol
Synonyms	Sulfur Black 1, Solubilised; C.I. Sulphur Black 1; C.I. 53185; Immedial Black VSF; Sulphur Black BRX; Kayaku Sulphur Black B; Dye Sulphur Black 1; Solubilised Sulphur Black; Leuco Sulphur Black 1; Sodium 4-[[4-[(2,5-diamino-7-sulfonato-1-naphthyl)diazenyl]-7-sulfonato-1-naphthyl]diazenyl]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulfonate
EINECS	215-418-6

Quality Control

Our Sulphur Black 1 -Solubilised is manufactured under a strict quality management system. Each batch is tested to ensure consistent strength, solubility, shade, and fastness properties. A comprehensive Certificate of Analysis (COA) detailing key parameters such as color strength, solubility, and impurity content is provided with every shipment to guarantee it meets your specific application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent caking or degradation.

Specification

Item	Specification
Appearance	Dark brown to black powder or granules
Identification (IR)	Conforms to standard
Color Strength	100% ± 3% (vs. Standard)
Solubility in Water	Complete, clear solution
Moisture Content	≤ 5.0%
Ash Content	≤ 3.0%
pH (1% Solution)	8.0 - 10.0
Fastness Properties (Typical on Cotton)	Wash: 4-5, Light: 5-6

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.