Sulfur dyes are the most commonly used dyes manufactured for cotton in terms of volume. They are inexpensive, generally have good wash-fastness, and are easy to apply. Sulfur dyes are predominantly black, brown, and dark blue. [1] Red sulfur dyes are unknown, although a pink or lighter scarlet color is available.

Mar 8, 2021 · What is Sulphur Dyes? Sulphur dyes are complex heterocyclic molecules or mixtures formed by melting or boiling organic compounds containing amino or nitro groups with Na-polysulphide and Sulphur. Sulphur dyes are so called as they all contain Sulphur linkage within their molecules.

Jan 1, 2011 · Sulphur dyes are non-ionic, possess sulphur linkage, are water insoluble and produce shades that are reasonably cheap and wash and light fast. Dyes are applied in reduced and solubilised anionic state possessing affinity for cellulosics.

May 3, 2012 · Sulphur dyes are one of the most commonly used dyes for producing bright black and brown shades on cellulosic fiber products. The chemistry of sulphur dye dyeing is similar to that of vat dye dyeing. In both cases, the final colour is developed by the oxidation process.

Sulfur dye, any of a group of sulfur-containing, complex synthetic organic dyes applied from an alkaline solution of sodium sulfide (in which they dissolve) to cellulose, where they become substantive to the fibre. On exposure to air, the dyes in the fibre are oxidized back to their original

What is Sulphur Dye? The dyes are so-called as they contain sulpher linkage but dissolve in Na-sulphide solution which acts as a reducing agent, breaking the sulpher linkage & converting the molecules into simpler components that are soluble in water & substantive towards cellulose.

This paper discusses the various types of sulphur dyes, their chemical structures, and the dyeing processes involved. Key topics include the chemical behavior of leuco, solublized, and condensed sulphur dyes, along with the necessary auxiliaries such as reducing agents, alkalis, and antioxidants that play vital roles in the dyeing process.

Discover the world of sulphur dyes, an affordable and versatile option for dyeing cellulose fibers like cotton, rayon, and viscose. Known for their excellent color depth and earthy shades, sulphur dyes are a popular choice for creating rich, long-lasting textiles with a unique, timeless appeal.

Sulphur dyes are widely used for black, blue, maroon, olive and green colours in medium to heavy depths. Fastness properties of sulphur dyes vary markedly throughout the range, e.g. light fastness of yellow dyes is almost 3 whereas black is about 7″. Wash fastness is generally good. Fastness to bleaching is poor except in the case of a few ...

Jun 12, 2024 · Sulphur dyes are a class of sulfur-containing dyes with relatively complex molecular structures. They are generally made by heating certain organic compounds such as aromatic amines and aminophenols with sulfur or sodium polysulfide, that is, sulfurization. Most sulphur dyes are insoluble in water.