| Alizarin is the main colourant molecule, but the extract also contains a closely related compound called purpurin, which imparts an orange colour. |
| Sudan 1's dark red properties make it an ideal colourant for petrol, oils, waxes and shoe polish. |
| Ammonia in hair dye softens the hair shaft to allow the colourant to penetrate and adhere to it. |
| New data were submitted in support of the application for authorisation without a time limit of this colourant. |
| A water soluble colourant may be added to the solution as a means of indicating which surfaces have been treated. |
| The turquoise colour of British faience results from using a copper-based colourant for the glaze. |
