Iron oxide, yomwe imadziwikanso kuti ferric oxide, burnt limonite, burnt ocher, chitsulo chofiira, chitsulo chofiira, ufa wofiira, Venetian red (chigawo chachikulu ndi iron oxide), ndi zina zotero. Fomula ya mankhwala ya Fe2O3, yomwe imasungunuka mu hydrochloric acid, ndi ufa wofiira-bulauni. Ufa wake wofiira-bulauni ndi utoto wotsika, womwe umatchedwa iron oxide wofiira m'mafakitale. Umagwiritsidwa ntchito mu utoto, inki, rabara ndi mafakitale ena ngati chothandizira, choyeretsera magalasi, miyala yamtengo wapatali ndi chitsulo, ndipo ungagwiritsidwe ntchito ngati zopangira popanga chitsulo.