Okiside y'icyuma, izwi kandi nka ferric oxide, burnt limonite, burnt ochre, fer red, fer red, fer red, red powder, Venetian red (igice cy'ingenzi ni fer oxide), nibindi. Formule ya shimi Fe2O3, ishongeshwa muri aside hydrochloric, ni ifu y'umukara utukura. Ifu yayo y'umukara utukura ni ibara ryo hasi, ryitwa fer oxide umutuku mu nganda. Ikoreshwa mu irangi, wino, kabutike n'izindi nganda nk'ingufu zikora ikirahure, amabuye y'agaciro n'ibyuma, kandi ishobora gukoreshwa nk'ibikoresho fatizo mu gukora icyuma.