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Dye is a colored substance that is used to impart color to materials, such as textiles, paper, or leather. Unlike pigments, which sit on the surface of the material, dyes are usually soluble and penetrate the material to produce a long-lasting coloration. Dyes can be derived from natural sources, like plants and minerals, or can be synthetically produced. They are widely used in industries for various purposes, including clothing, art, food coloring, and medical diagnoses.