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Understanding the Chemistry, Regulatory Pressures, and Strategic Integration of C.I. Sulphur Yellow 2 in Modern Manufacturing.
Sulphur Yellow 2 (Color Index: C.I. 53120) is an essential sulfur-based dyestuff prized for its outstanding affinity to cellulosic fibers, highly economical application profile, and remarkable wet-fastness ratings. Historically utilized in heavy-duty utility fabrics, Sulphur Yellow 2 has seen a technological renaissance due to advances in ecological reduction processes and purification techniques.
In today's global commercial landscape, dyestuff selection is no longer determined solely by coloristic performance; regulatory compliance is now a decisive metric. Buyers face intense pressure to eliminate hazardous chemicals from industrial waste streams. Consequently, high-purity OEM formulations of Sulphur Yellow 2 that reduce electrolyte and sulfide byproduct levels have become critical commodities for international denim and apparel brands.
This reference matrix outlines the typical chemical, structural, and performance parameters required by global buyers during the OEM procurement verification process.
| Chemical Characteristic | Standard Specification Value | Testing Protocol / Compliance standard |
|---|---|---|
| Color Index (C.I.) Name | C.I. Sulphur Yellow 2 (53120) | AATCC / ISO Color Index Reference |
| Physical Appearance | Yellow-Brown Uniform Powder / Concentrated Liquid | Visual / Spectrophotometric analysis |
| Solubility in Water | Requires reduction (Sodium Sulfide / Glucose system) | ISO 105-Z09 |
| Heavy Metal Tolerances | Cu < 50 ppm, Cr < 20 ppm, Ni < 10 ppm | ICP-MS analysis under ZDHC MRSL guidelines |
| Banned Arylamines | ND (Not Detected, limit < 5 ppm) | EN ISO 14362-1 (Strict Zero-Detection) |
| Light Fastness (Xenon Arc) | Grade 5-6 | ISO 105-B02 |
| Washing Fastness (60°C) | Grade 4-5 (Color Change & Staining) | ISO 105-C06 |
How global textile mills, paper manufacturers, and leather tanneries deploy Sulphur Yellow 2 to achieve precision tinting and high-performance durability.
Denim laundries utilize Sulphur Yellow 2 to achieve custom "dirty wash" effects, warm yellow-cast undertones, and green-cast indigos. When combined with modern bio-reducing agents (like glucose or thiourea dioxide), it creates robust, high-contrast laser-washable profiles that meet top-tier environmental certifications.
In paper manufacturing, Sulphur Yellow 2 provides excellent affinity for unbleached kraft pulp. Its strong chemical bond ensures high water-fastness, preventing bleeding or color migration in packaging materials. This makes it ideal for industrial-grade cardboard, heavy-duty shipping boxes, and eco-friendly shopping bags.
Tanneries require colorants that penetrate deeply into animal hides without compromising grain structure. Sulphur Yellow 2 forms stable coordination complexes within the collagen matrix during the chrome or vegetable tanning processes, providing exceptional light-fastness and resisting degradation from sweat and friction.
How intelligent manufacturing, digital quality tracking, and optimized logistics support global dyestuff supply chains.
Modern dyestuff manufacturing demands strict consistency. Our China Factory 4.0 production lines use advanced automation systems to monitor synthesis temperatures, raw material feed rates, and filtration parameters in real time. By reducing human error, we achieve batch-to-batch color stability with a standard deviation delta E (dE) of less than 0.5.
Additionally, our production plants use closed-loop recycling systems to drastically reduce wastewater discharge. Raw wastewater undergoes catalytic oxidation and membrane bioreactor processing to ensure it meets strict environmental standards. By prioritizing supply chain resilience, we protect our clients from regulatory disruptions and ensure a steady supply of certified Sulphur Yellow 2, even during periods of strict environmental oversight.
Tianjin Sunrise Chem Group: Backed by Decades of Expert Dye Manufacturing and Global Export Experience.
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs, including 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 always focus closely on product quality and consistency. Every shipment is tested before leaving for the port. With ZDHC Level 3 and GOTS certifications, your product quality and compliance are guaranteed.
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 eco-friendly, high-quality colorants that balance productivity with environmental harmony, driving the industry toward 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 shows that the factory has established strong and reliable business relationships. This kind of long-term collaboration brings numerous benefits, such as consistent orders, shared resources, and mutual support. It also indicates that the factory has a good track record of delivering quality products and meeting the needs of its 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.
With years of experience, we have successfully established strong partnerships in many countries. Our dedication to meeting global demands and exceeding customer expectations has earned us a reputation as a reliable supplier worldwide. If you are looking for reliable, high-quality dyes, we invite you to choose us as your trusted partner.
Our products comply with ZDHC MRSL Level 3, GOTS, and international environmental regulations, ensuring safe integration into sustainable supply chains.
A look at our storage, quality verification, and shipping operations that deliver high-performance dyestuffs to industrial plants worldwide.
A comprehensive catalog of industrial colorants designed to meet strict performance metrics across various substrates.
Find answers to common technical, ecological, and supply chain questions from our R&D team.
C.I. Sulphur Yellow 2 offers a highly cost-effective option for cellulosic fibers, particularly in denim tinting and packaging paper coloring. Compared to direct dyes, sulfur dyes provide significantly better washing and wet-fastness. While reactive dyes offer high brightness, Sulphur Yellow 2 excels in producing muted, earthy tones and deep shades with superior chemical stability under tough industrial conditions.
To achieve ZDHC Level 3 certification, we trace our entire production process back to the raw materials. We screen all inputs to prevent the introduction of restricted substances (such as heavy metal contaminants, chlorinated phenols, or banned arylamines) into the synthesis loop. We also perform analytical testing on every finished batch using gas chromatography-mass spectrometry (GC-MS) and inductively coupled plasma mass spectrometry (ICP-MS) before delivery.
While traditional sodium sulfide is highly effective, it creates high COD and BOD levels in wastewater. To reduce environmental impact, we recommend using organic reducing agents like glucose, thiourea dioxide, or hydroxyacetone in alkaline environments. These alternatives maintain dye yield and shade consistency while reducing sulfate levels in effluent discharge.
Yes. We offer customized liquid dye formulations tailored to automated dosing systems in paper mills. These liquid forms eliminate dust exposure, simplify dissolution, and prevent chemical spotting on paper machines, ensuring highly consistent color in kraft pulp and paperboard production.
We provide a range of packaging options, including 25kg multi-layer kraft paper bags, 25kg fiber drums, and 500kg/1000kg bulk bags. For OEM partners, we offer customized labeling, specific color concentration adjustments, and moisture-resistant barrier liners to ensure product integrity during long-distance ocean shipping.
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