|Black uniform powder or granules
|Approximate to the standard
|Insoluble impurities content in water(%)
(through the 250um sieve residue content%)
|Fineness(through the 590um sieve residue content%)
Sulfur Black Basic Information
Sulfur Black is a synthetic dye that is black and is derived from sulfur compounds. It has a molecular formula of C6H4N2O5S2 and a molecular weight of 240.23 g/mol. Sulfur black is insoluble in water or ethanol, green black in sodium sulfide solution, blue when caustic soda is put into black sulfur solution, and green precipitates when hydrochloric acid is used. The product is slightly soluble in cold sulfuric acid and turns green and blue after heating. It turns black and blue when heated continuously. Sulfide dyes have good dye uptake and level.
Application of Sulfur Black
Sulfur Black is a widely used dye in the textile industry for coloring fabrics. In Brazil, Sulfur Black is commonly used for dyeing cotton, viscose, and other cellulosic fibers. Due to its excellent color fastness properties, it is a preferred dye for applications that require dark and intense black colors, such as in the production of denim and other dark-colored garments. Sulfur Black is also used in the dyeing of various textiles, including home furnishings and upholstery. The dyeing process involves using sodium sulfide or sodium hydrosulfite to make the water-insoluble dye soluble, allowing it to penetrate the fibers and produce a uniform color.