High-purity liquid, powder, and solvent-based dyestuffs manufactured to meet stringent international standards.
An authoritative analysis of C.I. Acid Black 2 chemical structure, molecular characteristics, and synthesis standards.
Acid Black 2 (commonly known as Nigrosine water-soluble, C.I. 50420) is an azine class synthetic dye. Formulated through the catalytic condensation of aniline, aniline hydrochloride, and nitrobenzene in the presence of iron catalysts at elevated temperatures, its molecular architecture grants it excellent water solubility. This makes it highly sought after for applications demanding clean, deep blue-black shades without organic solvent residues.
From an analytical perspective, premium industrial Acid Black 2 must maintain a strict salt/ash content balance. The presence of excess sodium chloride or sodium sulfate can negatively impact color yield and clarity in high-performance applications. Tianjin Sunrise optimizes crystallization parameters to ensure that color strength yields (typically standardized at 100% to 200% compared to standard samples) exhibit a batch-to-batch variation coefficient of less than 3%, ensuring absolute dependability.
Why Chinese chemical clusters and Sunrise Chem lead the global supply chain for Acid Black 2 and industrial dyes.
Our facilities are strategically situated within China's primary petrochemical zones. This gives us direct pipeline access to key precursors like aniline and nitrobenzene. By eliminating high transportation costs and supply chain bottlenecks, we maintain an uninterrupted production schedule and pass the cost savings directly to global buyers.
Sunrise factories employ computer-controlled reaction systems. This technology precisely regulates oxidation temperatures, pH variations, and drying procedures. This automated execution keeps purity high, controls physical characteristics (such as crystal morphology and grain sizing), and minimizes batch variance.
Unlike small-scale plants that struggle with dynamic local environmental regulations, Sunrise factories operate comprehensive, integrated water treatment plants. Because we prioritize environmental harmony alongside output, we ensure our global partners can secure long-term, risk-free purchase agreements.
Engineered for high performance, verified by international standards, and trusted worldwide.
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs. Our extensive portfolio includes Direct dyes, Acid dyes, Basic dyes, Sulphur dyes, Solvent dyes, Liquid dyes, and Fluorescent dyes. Backed by decades of industry and export experience, we have built a reputation for reliability and excellence, serving clients from diverse sectors including denim, textile, leather, paper, and plastic.
We highly focus on goods quality and stability. Each shipment is tested before being sent to the port. Our ZDHC Level 3 and GOTS certification guarantees your quality is secure, ensuring that your manufacturing processes comply with strict global environmental laws.
We pride ourselves on offering customized solutions. Our team of experts works closely with clients to understand their unique needs and deliver tailored products and services. We actively seek strategic partnerships to expand our reach and enhance our offerings. Collaborate with us to explore mutual growth opportunities.
"Environmental protection is the cornerstone of our innovation. We dedicate ourselves to providing clients with eco-friendly, high-quality colorants that balance productivity with environmental harmony, driving the industry towards a more sustainable development path while delivering high-performance products—for a greener textile industry and a sustainable future."
Cooperating with textile and paper mills for many years demonstrates that our factory has established strong and reliable business relationships. This kind of long-term collaboration brings numerous benefits, such as consistent ordering patterns, shared technical resources, and mutual support. It also highlights our factory's track record of delivering quality products and meeting the needs of our partners.
Our mission is to drive business growth by providing reliable and customized 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 partnerships, we strive to be a catalyst for our clients' success.
Keeping global sourcing managers informed of key regulatory, purification, and logistical shifts.
Historically, Nigrosine dyes contained residual raw aniline. Strict limits from EU REACH and OEKO-TEX Eco-Passport standards have prompted Sunrise to develop an advanced manufacturing line that reduces free aniline levels to under 500 ppm—with high-purity variants dropping below 100 ppm. This makes our products ideal for sensitive skin-contact applications.
To minimize airborne dust in processing plants and simplify dosing systems, textile and paper mills are increasingly adopting liquid dye formulations. Sunrise is expanding its liquid dye research, creating stable, highly concentrated Acid Black 2 solutions that do not settle or separate over long storage intervals.
Modern global buyers require end-to-end supply chain transparency. Sunrise integrates digital tracking at our storage and shipping hubs, providing updates from the packaging line to port loading. This gives our buyers real-time visibility into transit conditions and schedules.
How our Acid Black 2 performs under real-world processing conditions across diverse industrial applications.
In premium leather processing hubs, Acid Black 2 must penetrate deep into the collagen fiber matrix of chrome-tanned or veg-tanned hides. Sunrise Acid Black 2 delivers exceptional fiber affinity and levels well in mildly acidic dye baths. This yields a rich, deep black finish that resists fading, dry rubbing, and wet rubbing.
For high-grade writing instruments and felt-tip marker inks, our dyes are ultra-filtered to remove all insoluble materials. This prevents write-out skips and marker tip clogging. Its stable molecular structure also prevents color separation when exposed to varying temperatures.
Wood preservation and aesthetic treatment require deep wood-pore penetration. When mixed in glycol or water-glycol co-solvent stain systems, Sunrise Acid Black 2 enhances the natural wood grain, providing high lightfastness that prevents yellowing or fading when exposed to sunlight.
In phenolic and polyamide engineering plastics, Nigrosine serves as an excellent colorant and process stabilizer. Our special dust-free granular forms disperse evenly into the polymer melt, ensuring consistent color distribution and physical integrity in the finished molded part.
Solving complex colorant problems with structured chemical engineering and logistics management.
We understand that manufacturing setups vary widely. Sunrise can customize our dyes to match your specific production requirements. We offer custom standardizations, salt adjustments, and custom packaging sizes to integrate seamlessly into your existing operations.
We minimize supply chain risks through multi-facility production backups and strategic raw material reserves. This allows Sunrise to guarantee consistent supply volumes and stable pricing, even during periods of market volatility.
Verified quality control programs and shipping security protocols.
Our chemical management system is designed to meet strict regulatory and ecological standards. By working closely with international inspection teams, Sunrise ensures that our processes comply with zero-discharge guidelines for hazardous chemicals.
A wider selection of our high-demand industrial dyes, optimized for diverse substrate applications.
Standard metrics and quality profiles required for streamlined B2B dye import processes.
When sourcing Acid Black 2, procurement officers should verify that:
• Water Insolubles: < 0.5% (to prevent filter blocking).
• Moisture Content: < 5.0% (to prevent clumping during storage).
• Heavy Metal Limits: Pb, Cd, Hg, and Cr must remain within ZDHC Level 3 requirements.
• Form Options: Available in crystalline powder or dust-free granular forms to fit different handling setups.
We offer flexible packing configurations, including standard 25kg multi-layer paper bags, 25kg fiber drums, and 500kg jumbo supersacks designed for automatic discharging systems. Additionally, all pallets are shrink-wrapped to prevent moisture absorption during maritime transit.
Direct answers from our laboratory technicians on the performance and application of Nigrosine Acid Black 2.
Our standardized Acid Black 2 exhibits a water solubility of approximately 50 g/L at 25°C. This solubility increases significantly at temperatures above 60°C. For optimal dissolution, we recommend pasting the dye with ambient-temperature water before adding hot water under continuous agitation.
Acid Black 2 is pH-sensitive. The optimal fixation range for wool and leather substrates is pH 3.5 to 5.5. At higher pH values, the dye's affinity for protein fibers decreases, which can lead to color bleeding. Conversely, excessive acidity may cause rapid exhaustion, resulting in uneven leveling.
ZDHC Level 3 compliance requires rigorous testing to ensure raw materials contain no MRSL-restricted substances. Sunrise audits its supply chain regularly, verifying all raw inputs and testing finished products through third-party laboratories.
Yes, our Acid Black 2 can be formulated into polar solvent systems, such as ethanol or glycol ethers, which are commonly used in industrial wood staining. For non-polar solvents like hydrocarbons, we recommend our specialized Solvent Black series (Nigrosine spirit-soluble).
We provide dust-suppressed powder grades treated with special wetting agents, as well as granular forms. These options minimize airborne dust particles, protecting worker health and preventing cross-contamination in mixing facilities.
When stored in its original sealed packaging in a cool, dry, well-ventilated warehouse away from direct sunlight, the dye remains stable for at least 36 months without losing color strength or changing shade.
Each batch is cross-checked against our standard reference samples using precision spectrophotometers. We adjust color strength and shade coordinates to keep variance below ΔE < 0.5 before releasing shipments from the factory.
Yes, we provide custom packaging configurations, including private labeling, color-coded bags, and water-soluble inner bags. These options allow for direct addition to mixing tanks without opening the primary container.
Explore our full line of industrial dyes, developed to support efficient manufacturing processes worldwide.
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