Icyuma kitagira umuyonga optique yaka nyuma yo kugena igena ubwiza bwicyuma.Hariho ibintu byinshi bigira ingaruka kumucyo, ariko cyane cyane mubintu bitanu bikurikira,

1. Niba kugera kubushyuhe bukenewe, ubushyuhe bwa annealing.Gutunganya ubushyuhe bwibyuma mubisanzwe bifata igisubizo cyo kuvura ubushyuhe, nanone ni abantu bakunze kwita "annealing", ubushyuhe buri hagati ya 1050 ~ 1100 DEG C. Urashobora kwitegereza unyuze mu mwobo wo kwitegereza itanura rya annealing, bizaba ari akarere ka annealing agace k’icyuma kitagira umwanda, ariko nticyoroshye.

Ikirere cya Annealing.Mubisanzwe ukoreshe hydrogène isukuye nkikirere cya annealing, ikirere cyubuziranenge bwiza burenze 99,99%, niba ikirere nikindi gice cya gaze ya inert, ubuziranenge nabwo burashobora kuba munsi gato, ariko ntibushobora kubamo ogisijeni nyinshi, umwuka wamazi.

3. Itanura ry'umubiri.Itanura ryaka cyane rigomba gufungwa, ryitaruye umwuka wo hanze;ukoresheje hydrogène nka gaze ikingira, isohoka rimwe gusa irahuzwa (ikoreshwa mugutwika hydrogène isohoka).Uburyo bwo kugenzura burashobora gukoreshwa guhanagura amazi yisabune mumatanura ya annealing ya buri rugingo, kugirango urebe niba gaze ikora;kimwe mubintu byoroshye gukoresha ahantu ha gazi ni umuyoboro wa feri ya annealing hamwe nuyoboro usohoka ahantu waho, impeta yo gufunga aha hantu byoroshye kwambara, igomba guhora igenzura impinduka zikunze kuba.

4. Kurinda umuvuduko wa gaze.Kugirango hirindwe ko havuka mikorobe, kurinda itanura rya gaze bigomba gukomeza umuvuduko mwiza, niba kurinda gaze ya hydrogène, mubisanzwe bisaba 20kBar.

5. Umwuka w'amazi.Ku ruhande rumwe kugirango harebwe niba umubiri wumisha itanura yumubiri, wabanje gushyirwaho itanura, ibikoresho byumubiri bigomba kuba byumye;byombi ni ukumenya niba amazi asigaye cyane mu itanura ryicyuma kitagira umwanda, umuyoboro udasanzwe hejuru niba hari ibyobo, ntukinjire, cyangwa ngo ushireho itanura ryarangiritse rwose.