▁These ▁O B As ▁are ▁available ▁in ▁different ▁t ints ▁such ▁as ▁blue , ▁vio let ▁and ▁red . ▁ ▁External ▁links ▁▁▁ ▁Text ile ▁Process ing ▁Guide ▁at ▁th es mart time . com ▁ ▁Category : Text iles ▁Category : Ind ust rial ▁processes ▁Category : Text ile ▁techniques <0x0A> </s> ▁The ▁Le ader ▁of ▁the ▁Official ▁O pp osition ▁in ▁the ▁House ▁of ▁Commons , ▁more ▁commonly ▁known ▁as ▁the ▁O pp osition ▁House ▁Le ader ▁( ), ▁is ▁a ▁member ▁of ▁the ▁Official ▁O pp osition , ▁not ▁to ▁be ▁confused ▁with ▁the ▁Le ader ▁of ▁the ▁Official ▁O pp osition , ▁but ▁is ▁generally ▁a ▁senior ▁member ▁of ▁the ▁front ben ch . ▁The ▁House ▁Le ader ▁is ▁responsible ▁for ▁question ing ▁the ▁Government ▁House ▁Le ader ▁on ▁the ▁forth coming ▁business ▁of ▁the ▁House ▁of ▁Commons , ▁negoti ating ▁with ▁the ▁Government ▁House ▁Le ader ▁and ▁other ▁parties ' ▁house ▁leaders ▁on ▁the ▁progress ▁of ▁business ▁in ▁the ▁House , ▁and ▁man aging ▁the ▁Official ▁O pp osition ' s ▁business ▁in ▁the ▁House ▁of ▁Commons . ▁ ▁The ▁position ▁of ▁O pp osition ▁House ▁Le ader ▁evol ved ▁in ▁the ▁ 1 9 5 0 s ▁as ▁each ▁O pp osition ▁party ▁began ▁to ▁design ate ▁a ▁particular ▁MP ▁to ▁question ▁the ▁ ▁Government ▁House ▁Le ader ▁on ▁up coming ▁House ▁business . ▁The ▁title ▁of ▁O pp osition ▁House ▁Le ader ▁became ▁official ▁in ▁ 1 9 6 3 , ▁and ▁in ▁ 1 9