Kuma ikirere: imyenda ntigomba guhura nizuba nyuma yo gukaraba, cyangwa ntigomba gushyukwa nuwumye.Mubisanzwe, bigomba gushyirwa ahantu hakonje kandi bihumeka kugirango byume.Kuberako imirasire ya ultraviolet izuba biroroshye gukora umwenda wubudodo uhinduka umuhondo, ugashira no gusaza.Kubwibyo, imyenda yubudodo ntigomba guhindurwa ngo ikureho amazi nyuma yo gukaraba.Igomba kunyeganyezwa gahoro gahoro hanyuma ikwirakwira mu kirere.Igomba gucuma cyangwa kunyeganyezwa kugeza 70% byumye.
Icyuma: kwihanganira imyunyu yimyenda ni bibi cyane kurenza fibre ya chimique, nuko rero haravugwa ngo "inkari yubusa ntabwo ari silike nyayo".Imyenda yijimye nyuma yo gukaraba ikenera ibyuma kugirango bibe byiza, byiza kandi byiza.Mugihe ucyuma, shyira imyenda kuri 70% yumye, utere amazi neza, hanyuma utegereze iminota 3-5 mbere yo gushiramo ibyuma.Ubushyuhe bw'icyuma bugomba kugenzurwa munsi ya 150 ° C. Icyuma ntigomba gukora ku butaka bwa silike kugirango wirinde aurora