Dyeing

Do you know why acid dyes are so called? Mostly acid dyes you will get are carboxylic or sulphuric acid salts. Often they are applied from an acidic bath. That’s why they are called “acid dye”. Though acid dyes possess pretty good light fastness, the wet fastness is not that good. Properties of Acid dyes … Read more

Acid dyes, the salt of sulphuric or carboxylic acid are normally applied from acidic medium and so get the name “acid dye”. Acid dye for nylon is a good choice. By controlling pH, heat, retarding agent, uniform dyeing can be achieved by acid dye for nylon. Though acid dyes having poor wash fastness, the light … Read more

Direct dyes are water soluble anionic dyes and retain sulphonic acid groups in structure. They are directly taken up by the fibers. In 1883, J. Walter of Geigy first discovered synthetic direct dye which was Direct Yellow 11. In 1956 SDC defined direct dye as, “Anionic dyes substantive to cellulose when applied from an aqueous … Read more

Pigment dyeing has gained that much popularity even though it is a comparatively recent addition. Actually, no chemical reactions take place between the dye and fiber. Only the pigment molecules get seated on the top of the fabric surface along with a binder. Pigments are insoluble in water and have no affinity for fibers. So, … Read more

Fiber reactive dyes are most popularly used to dye cellulosic fabrics. They chemically react with fibers and form covalent bond with them. They have wide range of shades and stain the textiles in your desired shade. What Is Pigment? Pigment comes from Latin word “pingue” which means “to paint”. pigments are aggregated molecules that is … Read more

Reactive dyes are so much popular for dyeing cellulosic fabrics. They can create a wide range of shades with excellent brilliancy. For a level dyeing the materials should be prepared very well. In his article, you will get an in depth discussion on reactive dye process. Typical reactive dye process involves the three major types. … Read more

Reactive dye is an important dye in our country for dyeing cellulosic fabrics. In this article, you will know the trade names of reactive dyes along with their application method and reactivity. Popularity of reactive dye is increasing day by day because of its properties like high brilliancy of color, wide range of shades and … Read more

Looking for reactive dye definition? You are on the right track! This article is all about reactive dye definition along with its components, influencing factors and most importantly dye hydrolysis. Stay tunned…. Reactive dye consists of reactive group that makes covalent bonds with the fiber structure. Thus it becomes a distinct part of the fiber. … Read more

Reactive dyes are widely used dyes in our country. They have reactive group in their structure which can create covalent bond with the textile fibers. They are very popular dyes in terms of excellent brilliancy, wide range of shades, overall good fastness properties. Reactive dye is used not only for textile dyeing, it is also … Read more

Reactive dye is the most important dye class for cellulosic materials. In the mid-1980s worldwide consumption of reactive dye for cellulosic material was 10-12% whereas about 40% of total dye consumption was presented by Japan alone. It offers a wide range of dyes with varying shades, fastness with high brilliancy and reproducibility.  Nowadays in our … Read more