| Ionone, a ketone first prepared by Tiemann, and having when diluted a pronounced violet odour. |
| Ionone is present in the flowers, which turns off the ability for humans to smell the fragrant compound for moments at a time. |
| He took some aubépine, an olfactory blend of finger paint and the wax used to clean linoleum floors, and added it to methyl ionone, a synthetic whose smell suggests iris. |
