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SUMMARY
Cotton fibres were scoured with acid and alkaline pectinases and bleached with peracetic acid. Because of similar treatment conditions of both processes, they were combined in one bath as one-step and two-step processes. At the beginning of the treatments, pH 5 was set for acid pectinases and pH 8 for alkaline pectinases. To activate the peracetic acid, pH was also adjusted during the process. Tetrasodium pyrophosphate was added to improve the effects of bleaching and scouring. The highest CIE whiteness values and water absorbencies were obtained in a one-step process with alkaline pectinases and peracetic acid.