Iipigment ze-iron oxide, ezidumileyo nge-inorganic colorants, zinezicelo ezahlukeneyo kumashishini amaninzi. Ekwakhiweni, zidlala indima ebalulekileyo ekufakeni imibala kwikhonkrithi, kwizitena, nakwi-asphalt. Nokuba zibomvu ezifudumeleyo zezitena zokuhombisa okanye imibala yomhlaba yeendlela zokuhamba ngeenyawo, ezi pigment ziphucula ukubonakala kakuhle ngelixa zikwakhusela ekugugulekeni yimozulu.

Ishishini leplastiki liyazuza kwezi pigment, lizisebenzisa ukufaka imibala kuyo yonke into ukusuka kwizinto zasekhaya ukuya kwizinto zoshishino, ukuqinisekisa ukuba umbala awugugi naphantsi kweemeko ezinzima. Ukongeza, ii-inki, izinto zokuthambisa, kunye nezinto zobugcisa zixhomekeke kwiipigment ze-iron oxide. Ukungabi natyhefu kwazo kuzenza zifaneleke kwizinto zokuthambisa, ngelixa kubugcisa, zibonelela abaculi ngemibala ezinzileyo necacileyo yemizobo kunye nemizobo.