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Dyes are released into the environment during dyeing of different substrates. Synthetic and natural textile fibres, plastics, leather, paper, waxes, and even foodstuffs and cosmetics are dyed by diffferent factories. All the azo dyes currently used are synthetic compounds and, hence, xenobiotics. The potential problems of azo dyes are recalcitrant in nature and human toxicity and vulnerable the environment as well. The release of colored compounds into the environment is undesirable not only because of their color, which may affect photosynthesis of aquatic plants, but also because many...