difference between dyes and pigments pdf

Difference Between Dyes And Pigments Pdf

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Dyes and Pigments: Their Structure and Properties

As defined by ETAD, The Ecological and Toxicological Association of Dyes and Organic Pigment Manufacturers, dyes are intensely colored or fluorescent organic substances only, which impart color to a substrate by selective absorption of light. Generally speaking, organic dyes are substances used to impart color. They can be applied for decorative or aesthetic color purposes, identification and more. Dyes are commonly dissolved in aqueous solutions in order to obtain optimal results. Color dyes, also referred to as dyestuff, are suitable for varying applications.

Dyes and pigments are substances that impart color to a material. The term colorant is often used for both dyes also called dyestuffs and pigments. The major difference between dyes and pigments is the particle size. Dyes are much finer than pigments. Therefore dyes are not UV stable whereas pigments are usually UV stable. Dyes, also known as colorants in which the coloring matter is dissolved in liquid, are absorbed into the material to which they are applied.

Dyes and pigments: new research

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Both pigments and dyes are used to color different materials, but the way in which they do it is very, very different. Think for a moment of two glasses of water standing side by side — the one is mixed with salt, the other with mud. Solubility The muddy water is brown, with all sorts of dirt and mud particles suspended in the water. Give it enough time and the particles will settle on the bottom of the glass. This mixture is called a suspension. Now take the salt water. Mixing the salt with the water results in it completely dissolving in the water.


The major difference between dyes and pigments is the particle size. Dyes are much finer than pigments. Therefore dyes are not UV stable whereas pigments are usually UV stable. Dyes, also known as colorants in which the coloring matter is dissolved in liquid, are absorbed into the material to which they are applied.


Dyes and Pigments

There are fundamental differences between dyes and pigments which are best explained by the definitions below. Dyes are intensely colored or fluorescent organic substances only, which impart color to a substrate by selective absorption of light. ETAD seeks to base its positions on sound science and to coordinate the efforts of its members to minimize any possible adverse impact of organic colorants on health and environment. Member companies are obliged to adhere to the ETAD Code of Ethics, which is based on the principles of responsible care.

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Chemists and other 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.

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