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Direct Blue Dyes are most commonly utilized for coloring fibers having high cellulose content including cotton. They are a type of substantive dyes that belongs to azo class and have chemical formula C34H24N6Na4O16S4 with molar mass of 992.804 g/mol. These dyes appear as fine amorphous blue colored powder with water soluble nature. Direct Blue Dyes can be produced by azo coupling of o-dianisidine with required naphthalene disulfonate.