, ▁alk ali ▁and ▁so ▁on . ▁Sc our ing ▁removes ▁all ▁the ▁w ax es , ▁p ect ins ▁and ▁makes ▁the ▁text ile ▁material ▁hydro ph il ic ▁or ▁water ▁abs orb ent . ▁See ▁also ▁sc our ing ▁w ool . ▁ ▁Ble aching ▁The ▁next ▁process ▁of ▁de color ization ▁of ▁gre ige ▁material ▁into ▁a ▁suitable ▁material ▁for ▁next ▁processing ▁is ▁called ▁ble aching . ▁Ble aching ▁of ▁text iles ▁can ▁be ▁class ified ▁into ▁ox id ative ▁ble aching ▁and ▁re duct ive ▁ble aching . ▁ ▁Ox id ative ▁ble aching ▁Gener ally ▁ox id ative ▁ble ach ings ▁are ▁carried ▁out ▁using ▁sod ium ▁hy po ch lor ite , ▁sod ium ▁ch lor ite ▁or ▁sul fur ic ▁acid . ▁Natural ▁fib res ▁like ▁cot ton , ▁ram ie , ▁j ute , ▁w ool , ▁b am bo o ▁are ▁all ▁generally ▁ble ached ▁with ▁ox id ative ▁methods . ▁ ▁Red uct ive ▁ble aching ▁Red uct ive ▁ble aching ▁is ▁done ▁with ▁sod ium ▁hyd ros ul ph ite , ▁a ▁powerful ▁reducing ▁agent . ▁F ib res ▁like ▁poly am ides , ▁poly ac ry lic s ▁and ▁poly ac et ates ▁can ▁be ▁ble ached ▁using ▁re duct ive ▁ble aching ▁technology . ▁ ▁Opt ical ▁wh iten ers ▁After ▁sc our ing ▁and ▁ble aching , ▁optical ▁bright ening ▁agents ▁( OB As ) ▁are ▁applied ▁to ▁make ▁the ▁text ile ▁material ▁appear ▁a ▁more ▁brilliant ▁white .