Sulphur Dyes

Sulphur dyes are complex heterocyclic molecules or mixtures formed by melting or boiling organic compounds containing amino or nitro groups with Na-polysulphides and sulphur. They are called sulphur dyes because they all contain sulphur bonds in their molecules. Sulphur dyes are predominantly black, brown and dark blue.

Sulphur dyes are applied in the reduced and dissolved anionic state possessing an affinity for cellulose. Oxidation is carried out after dyeing to restore the structure of the parent nonionic dye; the attachment of sulphur dyes to cellulose is established by the physical force of in situ aggregation of the dye. Sulphur dyes are known for their excellent color fastness, including resistance to washing, light and perspiration. This makes them suitable for applications where durability and color retention are critical. The primary use of sulphur dyes is to dye cotton and regenerated cellulose, in the form of yarn, cloth and garments, or as a component of blends.

As a professional supplier of high-efficiency dyes, Alfa Chemistry has the ability to provide customers with a comprehensive range of sulphur dyes.

Sulphur Dyes-Lists

Chemical Structure of Sulphur Dyes

The chemical structure of sulphur dyes is neither clear nor consistent; it is determined by the raw materials and the processes used. Dyes retain sulphur bonds as part of their chromophores and are essentially complex mixtures of polymer molecular species. Among the heterocycles, sulphur in the form of sulphide (-S-), disulphide (-S-S-), and polysulphide (-S_n-) links accounts for a large proportion. The chromogenic system is mainly based on thiazoles, thiazone and thianthrenes, with a few dyes retaining thiazole thioanthraquinones as their chromophore (figure 1) ^[1].

Fig. 1 Various chromophoric systems in sulphur dyes

Features of Sulphur Dyes

Alfa Chemistry is committed to becoming a first-class, low-carbon, environmentally friendly dye supplier. Our mission is to provide customers with full specifications of high-quality dyes. We are also constantly expanding our product database to meet the wide range of customer needs. You are welcomed to contact us for more sulphur dyes.

It is important to note that our products are for research use only and are not for clinical use.