Ikirahuri cy'ikirahure cy'ibara rihindura ibara ririmo urugero rwa silver chloride, sensibilisateur n'umuringa. Ukurikije urumuri rugufi, rushobora kubora muri atome ya feza na atome ya chlorine. Atome ya Chlorine ntabwo ifite ibara na atome ya feza ifite ibara. Ubwinshi bwa atome ya feza irashobora gukora imiterere ya colloidal, aribyo tubona nkibara rya lens. Iyo urumuri rwizuba rukomeye, niko atome ya feza itandukanijwe, lens izaba yijimye. Intege nke zumucyo wizuba, atome nkeya ya feza iratandukanye, lens izaba yoroshye. Hano nta e urumuri rwizuba ruba mucyumba, bityo lens ziba ibara.