Isahani idafite ibyuma ifite ubuso bworoshye, plastike ndende, ubukana nimbaraga za mashini, kandi irwanya kwangirika kwa aside, gaze ya alkaline, igisubizo nibindi bitangazamakuru.Nubwoko bwibyuma byoroshye bitoroshye kubora, ariko ntabwo ari ingese rwose.Isahani idafite ibyuma bivuga isahani yicyuma irwanya kwangirika kwibitangazamakuru bidakomeye nkikirere, umwuka hamwe namazi, mugihe icyuma kirwanya aside bivuga icyuma cyihanganira kwangirika kwibikoresho byangiza imiti nka aside, alkali numunyu.Isahani idafite ibyuma ifite amateka arenga ikinyejana kuva yasohotse mu ntangiriro z'ikinyejana cya 20.