Ibyuma bidafite ingese bimaze imyaka irenga ijana bikoreshwa. Igizwe nurwego runini rushingiye ku byuma, ariko bitandukanye nicyuma gisanzwe birwanya ruswa kandi ntibishobora kubora iyo bihuye namazi yonyine. Ikintu kivanze gikora ibyuma 'bitagira umwanda' ni chromium; icyakora niyongeweho nikel ituma ibyuma bidafite ingese bihinduka ibinini byinshi.
Igihe cyo kohereza: Nzeri-22-2020