| FIERCER | Processing of ferric oxide, ultimately more intense (7) |
| JEWELLERSROUGE | Finely powdered form of ferric oxide used as a polish for soft metals and optical glass, typically red in colour (9,5) |
| OCHRE | Natural clay earth pigment; a mixture of ferric oxide, clay and sand (5) |
| LUSTIER | Looking back at a bit of pleasure, it's ultimately more passionate (7) |
| HOOKIER | 17 and Viz: humour ultimately more like 17's conk (7) |
| IRONRED | Pigment containing ferric oxide |
| NEEDIER | Born to pass away poor, ultimately - more so than others |
| LANOLIN | All in on processing of substance used in soap (7) |
| NATURAL | Normal processing of tarantula at outset (7) |
| RUST | Name a coating which consists chiefly of ferric hydroxide and ferric oxide (4) |
| IRONORE | Material containing ferric metal (4,3) |
| IRONS | Smoothing devices historically heated in a fire or filled with hot coals; golf clubs, harpoons, pistols, shackles or stirrups; or, meteorites containing a high proportion of ferric metal (5) |
| CALAMINE | A pink powder consisting of zinc oxide and ferric oxide, used medicinally in the form of a soothing lotion (8) |
| ROUGE | Type of blusher originally made with safflower; French red wine; or, metal polishing powder of ground ferric oxide, also called crocus (5) |
| UMBER | Any of various natural brown earths that contain ferric oxide with lime |
| COGNITION | The symbolic, or top-down, approach in AI research seeks to replicate intelligence by analyzing _________ independent of the biological structure of the brain, in terms of the processing of symbols (9 |
| VENETIAN | - red; ferric oxide (jeweller's rouge) as a pigment; a colour used by Henri Matisse in some of his paintings (8) |
| INDIANRED | Ferric oxide pigment (6,3) |
| SIENNA | A natural earth containing ferric oxide used as a pigment (6) |
| ROUGES | Jeweler's ferric oxide powders |
