| Answer | Crossword Clue |
|---|---|
| colcothar | (Arabic) a reddish brown oxide of iron, used in polishing glass |
| colcothars | COLCOTHAR, (Arabic) a reddish brown oxide of iron, used in polishing glass |
| rouge | red powder consisting essentially of ferric oxide used in polishing glass, metal, or gems and as a pigment |
| 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 |
