| Answer | Crossword Clue |
|---|---|
| croci | dark red ferric oxide used for polishing metals |
| rouge | red powder consisting essentially of ferric oxide used in polishing glass, metal, or gems and as a pigment |
| sinopie | a red to reddish-brown earth pigment used by the ancients that depends for its color on its content of red ferric oxide |
| ferritic | any of several magnetic substances that consist essentially of ferric oxide combined with the oxides of one or more other metals (as manganese, nickel, or zinc), have high magnetic permeability and high electrical resistivity, and are used especially in electronic devices |
| limonites | amorphous hydrated ferric oxide, varying in color from dark brown to yellow, used as an ore of iron |
| limonite | amorphous hydrated ferric oxide, varying in color from dark brown to yellow, used as an ore of iron |
