When specifying a colour in CAD-Duct Solids/CAD-Mech, the name of the colour or its number may be entered. Standard colour names are available for colours 1 - 7 Colours 1 to 9:
| Colour | Number | Name |
| n | 1 | Red |
| n | 2 | Yellow |
| n | 3 | Green |
| n | 4 | Cyan |
| n | 5 | Blue |
| n | 6 | Magenta |
| n | 7 | Black/White |
| n | 8 | Grey (Dark ) |
| n | 9 | Grey (Light) |
The default colour is 1 - Red. All other colours must be specified by a number (8 through 255).