Explore our premium grade dyestuffs, liquid colors, and pigments manufactured under strict international standards.
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs. Our comprehensive product portfolio includes Direct dyes, Acid dyes, Basic dyes, Sulphur dyes, Solvent dyes, Liquid dyes, and Fluorescent dyes. Backed by decades of deep industry and export experience, we have built a rock-solid reputation for reliability and excellence, serving global clients from diverse industrial sectors including denim, textile, leather, paper, and plastic.
We always focus intensively on product quality and batch-to-batch stability. Every single shipment undergoes rigorous analysis and lab testing before dispatch to ensure it complies with local and international requirements. Our ZDHC Level 3 compliance and GOTS certification offer an absolute guarantee that our manufacturing practices support ecological safety and transparency across the entire value chain.
"Environmental protection is the cornerstone of our innovation. We dedicate ourselves to providing clients with eco-friendly, high-performance colorants that balance high yield productivity with environmental harmony, driving the textile industry toward a sustainable, zero-discharge future."
Years Industrial Experience
Zero Discharge Certified
Exporting Destinations
Batch Quality Tested
A comprehensive examination of chemical synthesis pathways, product optimization, and the transition toward green reducing agents.
Sulphur Black B (C.I. Sulphur Black 1) remains the most commercially significant dyestuff for cellulosic fibers, particularly denim warp yarns, due to its unmatched color depth, high economic viability, and excellent wash and light fastness properties. The chemical synthesis of Sulphur Black B traditionally involves the polysulphurization of 2,4-dinitrophenol (DNP) under heat, forming a complex polymeric structure containing disulfide bridges (-S-S-) and polysulfide chains.
To meet modern ecological criteria, our technical roadmap focuses on three core areas: reducing the presence of inorganic salts, improving solubility through clean reduction, and transitioning toward stable liquid formulations.
Moving away from traditional sodium sulfide (Na₂S) reducing agents to non-toxic alternatives like glucose, hydroxyacetone, or low-sulfur liquid formulations to drastically lower COD/BOD levels in textile effluents.
Deploying advanced membrane filtration systems during the isolation phase to eliminate inorganic salts (such as sodium sulfate and sodium chloride). This produces high-strength, low-salt powders and stable liquids.
Our pre-reduced liquid Sulphur Black B eliminates the need for prior dissolving stages, offering denim mills a ready-to-use, dust-free formulation that integrates seamlessly into automated dosing systems.
In its oxidized state, Sulphur Black B is completely insoluble in water. It requires a reducing agent in an alkaline medium to convert it into its water-soluble leuco form, which has a high affinity for cellulose. Once absorbed by the cotton fiber, it is oxidized back to its insoluble pigment state, locking the rich black color deep within the amorphous regions of the fiber. Below is a comparative overview of our Sulphur Black B formulations:
| Parameters | Sulphur Black B Granular (Standard) | Sulphur Black B Crystal (High Strength) | Pre-Reduced Liquid Sulphur Black B |
|---|---|---|---|
| Appearance | Black Granules | Shiny Black Crystals | Dark Viscous Liquid |
| Strength / Concentration | 100%, 150%, 200%, 240% | Up to 260% | 30% - 50% Active Content |
| Solubility in Na₂S solution | Excellent (>80g/L at 80°C) | Excellent (>90g/L at 80°C) | Miscible in water in all proportions |
| Inorganic Salt Content | Standard (<15%) | Low Salt (<8%) | Ultra-low Salt (<3%) |
| Environmental Footprint | Conventional COD/BOD | Optimized COD/BOD | Eco-preferred (Minimum waste discharge) |
Cooperating with textile and paper mills for many years demonstrates that our factory has established a strong, highly reliable business relationship. This kind of long-term collaboration brings numerous benefits, such as consistent ordering schedules, shared technical resources, and mutual technical support. It also indicates that the factory has a proven track record of delivering quality products and meeting the complex requirements of its global partners.
Our primary mission is to drive business growth for our clients by providing reliable, customized colorant products. Our goal is to make a significant contribution to our customers' success by consistently delivering first-class products and exceptional customer service. By building lasting, transparent partnerships, we strive to be a catalyst for our clients' long-term business success.
How Sulphur Black B and associated dyestuffs provide high performance across textile, denim, leather, and paper mills.
Sulphur Black B is widely applied as a bottoming or topping agent for indigo-dyed denim. It provides deep, rich, dark cast effects, creating unique wash-down properties desired by global fashion brands.
It provides a cost-effective, high-fastness black color for heavy cotton canvases, cords, workwear, and knitwear. Excellent wash and rub fastness parameters make it ideal for utilitarian garments.
For industrial packaging, heavy paperboard, and decorative paper mills. Our liquid dyestuffs provide high affinity for cellulosic wood fibers, eliminating color bleeding and optimizing dye retention.
Our Acid, Basic, and Sulphur dyes are formulated for deep penetration into the animal hide cross-sections. They produce uniform, intensely saturated shades that resist buffing and wet-rub degradation.
Using our solvent and complex colorants, polymer manufacturers produce high-heat resistant masterbatches for automotive, packaging, and high-durability synthetic plastics.
Whether in hank, package, or warp dyeing systems, our formulations guarantee consistent leveling and penetration. This minimizes shading variations between the outer and inner sections of the yarn package.
Leveraging high production capacity, automated quality control, and direct port logistics for absolute supply reliability.
One of the main reasons why customers choose us is the highly stable, resilient supply of dyes we provide. Over the years, we have developed automated manufacturing systems that ensure continuous, high-volume production. Our factory is equipped with modern reactors, automatic packing lines, and centralized digital warehouses that allow us to fulfill the most demanding global orders, even during peak seasons.
In addition to supply security, the consistent quality of our dyes sets us apart. Our chemical engineers carefully monitor every parameter of the synthesis process, including temp control, pH modulation, and condensation speed. Each finished batch is subjected to comprehensive spectrophotometric, chromatography, and fastness tests before shipping to the port. This ensures your final product maintains color consistency across different production lots.
Located near major shipping gateways, our logistics team manages customs clearance and document processing. This guarantees seamless shipping, minimizes transit times, and reduces freight costs for our overseas clients.
Tailored strength, customized physical forms, packaging solutions, and private label support for global distributors.
We tailor the dyestuff strength (e.g. Sulphur Black B 200%, 220%, 240%) to match your target formulation, reducing shipping costs per unit of active colorant.
Select the physical form that fits your mill: free-flowing dustless granules, fine powder, brilliant crystal flakes, or ready-to-inject pre-reduced liquid dye formulations.
We supply in 25kg multi-layer kraft paper bags, 25kg woven bags, 25kg fiber drums, or custom-designed IBC totes for liquid products, labeled with your own corporate branding.
Fulfilling the most stringent regulatory benchmarks: ZDHC Level 3 and Global Organic Textile Standard (GOTS).
ZDHC Certification: The Zero Discharge of Hazardous Chemicals (ZDHC) program is a collaborative effort by leading global brands, retailers, and chemical manufacturers to eliminate harmful substances throughout the textile and footwear supply chain. Achieving ZDHC Level 3 certification—the highest level of chemical compliance—demonstrates that our raw materials, processes, and finished colorants meet strict environmental safety requirements.
GOTS Certification: The Global Organic Textile Standard (GOTS) is the leading standard for organic fibers. It covers the entire textile chain, enforcing strict ecological and social criteria. Our GOTS-certified dyes ensure that your organic textile lines remain fully certified and compliant from the farm to the store shelf.
By prioritizing clean chemical inputs, minimizing heavy metal impurities, and reducing the discharge of organic sulfur, we help your business reduce its environmental footprint while maintaining excellent coloring performance.
Photos of our warehouse storage, container loading operations, and production consistency control.
Get answers to common technical, shipping, and application questions about Sulphur Black B.
Browse our selection of specialized direct, acid, and solvent dyes for paper, textile, leather, and plastic applications.
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