Feb 16, 2012 · Direct dye is defined as anionic dyes with substantivity for cellulosic fibers, normally applied from an aqueous dyebath containing an electrolyte, either sodium chloride (NaCl) or sodium sulfate (Na 2 SO 4). Direct dye generally conform to the formula Y1–N═N–X–N═N–Y2, and typical examples are C.I. Direct Blue 1 and C.I. Direct Orange 25.

Nov 18, 2023 · Direct dyes are one of the most important dye classes in the textile coloration process. However, a magnificent fusion of art, science, and industry may be found in the intriguing world of dyes and pigments, which has a unique charm.

Direct dye, any of a class of coloured, water-soluble compounds that have an affinity for fibre and are taken up directly, such as the benzidine derivatives. Direct dyes are usually cheap and easily applied, and they can yield bright colours.

Jul 24, 2024 · Direct dyes are a class of water-soluble, colored compounds that have an affinity for fibers such as cellulose, found in materials like cotton and wool. They belong to the anionic dye family and are easily applied to textiles without additional chemicals or processes.

Apr 25, 2024 · What are direct dyes and reactive dyes? Ans: Direct dyes are water-soluble dyes that directly dye fibers without needing a mordant, suitable for natural fibers like cotton. Reactive dyes, on the other hand, form covalent bonds with fibers, making them …

Mar 29, 2023 · Direct dyes are used to colour cellulosic and synthetic fibers. They are known for their bright and vivid colours and have a low molecular weight, allowing them to penetrate the fibers easily.

Oct 6, 2023 · An anionic dye which have substantivity for cellulosic fibres, normally applied from an aqueous dye bath containing an electrolyte is known as Direct dye.

Nov 6, 2023 · What are Direct Dyes? Direct dyes represent a category of colourants characterised by their straightforward application and versatility. They are commonly used for dyeing textiles and other materials, owing to their ease of use and strong affinity for cellulosic fibres like cotton, rayon, and paper. These dyes can be easily dissolved in water ...

Jan 26, 2023 · Through this article, you will learn the meaning of direct dyes, their properties and methods, and the direct dyeing process of cellulosic fibers. Direct dyes belong to the azo dye group and are water-soluble.

Jan 1, 2011 · Direct dyes are inherently substantive to cotton and other cellulosic substrates. Their aqueous solutions dye cotton generally in the presence of an electrolyte such as sodium chloride or sodium sulphate. Historically they replaced naturally occurring mordant dyes.