Eight commercially textile azo dyes are used in this textile dying industry. They are Metanil yellow, Fast Orange, Fast
Red, Direct Blue, Acid Fast Red, Direct Fast Scarlet, Congo Red and Acid Fast N Blue.
The final textile sample effluents just before discharging were taken and their light absorbance was measured at wavelengths of 660 nm.
UV–Vis spectra were determined using a spectrophotometer Spekol 1300, Analytika Jena, Spain