Dyes and Pigments - Organic And Inorganic Colorants, Synthetic Colorants, Pigments, Dyes, Utilization
coloring soluble chemical name
Color scientists use the term "colorant" for the entire spectrum of coloring materials, including dyes and pigments. While both dyes and pigments are sources of color, they are different from one another. Pigments are particles of color that are insoluble in water, oils, and resins. They need a binder or to be suspended in a dispersing agent to impart or spread their color. Dyes are usually water soluble and depend on physical and/or chemical reactions to impart their color. Generally, soluble colorants are used for coloring textiles, paper, and other substances while pigments are used for coloring paints, inks, cosmetics and plastics. Dyes are also called dyestuffs. The source of all colorants is either organic or inorganic.
Colorants are classified according to their chemical structure or composition (organic or inorganic), method of application, hue, origin (natural or synthetic), dyeing properties, utilization, and, sometimes, the name of the manufacturer and place of origin. The Society of Dyers and Colourists and the American Association of Textile Chemists and Colorists have devised a classification system, called the Color Index, that consists of the common name for the color, and a five-digit identification number.
Additional Topics
Organic colorants are made of carbon atoms and carbon-based molecules. Most organic colors are soluble dyes. If an organic soluble dye is to be used as a pigment, it must be made into particle form. Some dyes are insoluble and must be chemically treated to become soluble. Vegetable-based organic colorants are produced by obtaining certain extracts from the plants. An example of a dye that is not w…
The color of a pigment is deposited when the spreading agent dries or hardens. The physical property of a pigment does not change when it is mixed with the agent. Some organic dyes can be converted into pigments. For example, dyes that have salt groups in their chemical structure can be made into an insoluble salt by replacing the sodium molecule with a calcium molecule. Dyes that depend on chemic…
Dyes are dissolved in a solution and impart their color by staining or being absorbed. What makes one organic source a dye and another not depends on a particular groups of atoms called chromophores. Chromophores include the azo group, thio group, nitroso group, carbonyl group, nitro group, and azoxy group. Other groups of atoms called auxochromes donate or accept electrons and attach to the dye m…
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User Comments
about 2 years ago
opu
why there is not any structure of pigment dyes?