Desh Dye Chem

  • Natural Dyes :  Our Manufacturing are simply dye substances extracted from natural sources. Although the main source of dyes for early times, they have largely been replaced by synthetic dyes, which are usually more reliable, cheaper and can be supplied more readily. Natural dyes still in use include hematologist, carmine, orcein.Co louring materials have been used for many thousands of years by man. Leather, cloth, food, pottery and housing have all been modified in this way. Some of our most common dyes are still derived from natural sources. These are termed natural dyes. The Colour Index uses this as a classification and naming system.
    Each dye is named according to the pattern: 
    Natural + base  color + number 
    Natural dyes are often negatively charged. Positively charged natural dyes do exist, but are not common. In other words, the colored part of the molecule is usually the anion. Although the molecular charge is often shown on a specific atom in structural formulae, it is the whole molecule that is charged. Many, but by no means all, natural dyes require the use of a mordant.
  • Synthetic dye:  Dyes derived from organic or inorganic compound are known as synthetic dyes. Examples of this class of dyes are Direct, Acid, Basic, Reactive, Mordant, Metal complex, Vat, Sulphure , Disperse dye etc. Synthetic dyes quickly replaced the traditional natural dyes.
    They cost less, they offered a vast range of new colors, and they imparted better properties to the dyed materials dyes are now classified according to how they are used in the dyeing process. Many types of dyes:  Acid dye:  Acid dyes are water-soluble anionic dyes, containing one or more sulfonic acid substituents or other acidic groups. An example of the class is Acid Yellow 36. Acid dyes are water-soluble anionic dyes that are applied to fibers such as silk, wool, nylon and modified acrylic fibers using neutral to acid dye baths. Acid dyes are not substantive to cellulosic fibers. Most synthetic food colors fall in this category. The dyeing process is reversible and may be described as follows:
//]]>