Overview
Direct Scarlet, also known as Scarlet 4BS or Direct Red 23, is a synthetic azo dye widely used in the textile and paper industries. It belongs to the direct dye category, which means it bonds directly to fibers without the need for a mordant. This dye is prized for its vibrant red color and excellent dyeing properties, making it a popular choice for coloring cotton, silk, and paper products. Developed in the early 20th century, Direct Scarlet has become a staple in industrial dyeing processes due to its affordability and ease of application. Its chemical structure includes azo groups, which are responsible for its bright color and stability. The dye is typically supplied as a reddish-brown powder that dissolves easily in water, facilitating its use in various dyeing applications.
Physical and Chemical Properties
Direct Scarlet is characterized by its high solubility in water and moderate solubility in ethanol. The dye appears as a reddish-brown powder and is stable under normal storage conditions. Its molecular formula, C35H25N7Na2O10S2, reflects its complex structure, which includes azo groups and sulfonate groups that enhance its water solubility and dyeing efficiency. The dye exhibits excellent color fastness, meaning it resists fading when exposed to light, washing, or perspiration. This property is particularly important for textiles that undergo frequent laundering. Direct Scarlet is also known for its stability in acidic and neutral pH ranges, making it versatile for various dyeing processes. However, it may degrade under strongly alkaline conditions, so pH control is essential during application.
Main Applications
Direct Scarlet is primarily used in the textile industry for dyeing cotton, silk, and other natural fibers. Its bright red hue and excellent dyeing properties make it ideal for producing vibrant fabrics for clothing, home textiles, and accessories. The dye is also used in the paper industry to color paper products, including packaging materials and decorative papers. In addition to textiles and paper, Direct Scarlet finds applications in the production of inks and coatings. Its ability to dissolve easily in water makes it suitable for liquid ink formulations. Some manufacturers also use it as a colorant in specialty products, such as candles and soaps, where a bright red color is desired. The dye's versatility and affordability have cemented its position as a go-to option for industrial coloring needs.
Safety and Storage
While Direct Scarlet is generally safe for industrial use, proper handling and storage are essential to minimize risks. The dye should be stored in a cool, dry place away from direct sunlight to prevent degradation. Containers should be tightly sealed to avoid moisture absorption, which can affect the dye's performance. Workers handling Direct Scarlet should wear protective gloves, masks, and goggles to prevent skin contact, inhalation, or eye exposure. In case of accidental contact, rinse the affected area with plenty of water and seek medical advice if irritation persists. The dye is not classified as highly hazardous, but prolonged exposure should be avoided. Dispose of any waste material in accordance with local environmental regulations to prevent contamination.
B2B Procurement Guide
When procuring Direct Scarlet, B2B buyers should prioritize suppliers who provide detailed technical specifications, including CAS number (3441-14-3) and purity levels. Reputable suppliers often offer batch-specific certificates of analysis to ensure consistency and quality. Buyers should also inquire about packaging options, as bulk orders may require customized solutions to prevent moisture exposure during transit. Price negotiations are common, especially for large-volume purchases. The reference price range is approximately $5-$15 per kilogram, but discounts may be available for long-term contracts or bulk orders. Buyers should also consider logistics, such as lead times and shipping costs, to ensure timely delivery. Establishing a relationship with a reliable supplier can help secure consistent quality and favorable terms over time.
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