Overview
Ye Qing, commonly known as Indanthrene Blue RS, is a synthetic vat dye belonging to the anthraquinone class. It is renowned for its deep blue color and exceptional stability under various conditions. Developed in the early 20th century, it has become a staple in textile dyeing due to its superior performance compared to natural dyes. Vat dyes like Ye Qing require a reduction process before application, which makes them particularly suitable for cellulosic fibers. Their insolubility in water ensures minimal bleeding during washing, contributing to their popularity in high-quality fabric production.
Physical and Chemical Properties
Ye Qing appears as a dark blue powder with a high melting point exceeding 300°C, indicating its thermal stability. It is insoluble in water but dissolves in concentrated sulfuric acid, a property leveraged during the dyeing process. The molecular structure of C28H14N2O4 contributes to its vivid color and resistance to fading. The dye's insolubility in water necessitates a reduction step using alkaline solutions (e.g., sodium hydrosulfite) to convert it into a soluble form. Once applied, oxidation reverts it to its insoluble state, locking the color into the fabric. This mechanism ensures long-lasting vibrancy even after repeated washing or exposure to sunlight.
Main Applications
Ye Qing is predominantly used in the textile industry for dyeing natural fibers such as cotton, wool, and silk. Its excellent colorfastness makes it ideal for products requiring durability, including workwear, upholstery, and outdoor fabrics. The dye is also employed in niche applications like artist pigments and specialty coatings. In B2B contexts, bulk procurement is common for large-scale textile manufacturers. The dye's consistency and compliance with industry standards (e.g., OEKO-TEX®) are critical factors for buyers. Emerging markets are exploring its use in sustainable dyeing processes, aligning with eco-friendly textile trends.
Safety and Storage
While Ye Qing is not highly toxic, precautions are necessary to avoid inhalation of dust or prolonged skin contact. Proper ventilation and personal protective equipment (PPE) such as gloves and masks are recommended during handling. Storage should be in tightly sealed containers, away from moisture and direct sunlight to prevent degradation. Disposal must comply with local environmental regulations, as synthetic dyes can impact aquatic ecosystems. Suppliers often provide Material Safety Data Sheets (MSDS) detailing safe handling practices. B2B buyers should prioritize suppliers who adhere to international safety and environmental standards.
B2B Procurement Guide
When procuring Ye Qing, verify the CAS number (81-77-6) and request certificates of analysis to confirm purity and compliance with textile-grade specifications. Reputable suppliers should provide batch-specific testing reports. Pricing varies based on quantity and purity, with bulk orders typically offering cost advantages. Consider logistics and storage requirements, as the dye's stability depends on proper conditions. Establish long-term partnerships with suppliers who demonstrate reliability and transparency. For sustainable sourcing, inquire about eco-certifications or alternatives like low-impact vat dyes.
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