A dye is a coloured compound that binds chemical to the substrate to which it is applied. This differentiates dyes from pigments that do not bind chemically to the substance they paint. The dye is normally applied in an aqueous solution to increase the strength of the dye on the fibre and may require a mordant. Both dyes and pigments are coloured, so they only absorb those visible light wavelengths. In water, dyes are typically soluble, whereas pigments are insoluble. With the addition of salt to create a lake pigment, certain dyes may be made insoluble or solid precipitate. Roots, berries, bark, leaves, wood, fungi and lichens are the majority of natural dyes extracted from plant sources. Most dyes are synthetic, means man-made from petrochemicals. The industrial dyes and pigments market is specifically categorized under the two headings namely commodity and specialty. A pigment is a material that changes the colour of reflected or transmitted light as the result of wavelength-selective absorption

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