What colour is Prompt?
The patina of Prompt natural cement concretes and mortars produces a buff colour. On a moulded or form-work surface, this colour can be obtained quickly by removing the form work or mouldings as soon as the setting is complete. The damper the atmosphere when the concrete is fresh, the stronger the shade of red.
Surfaces whose form-work has been removed after several hours or several days will be of shade closer to light grey. Coloured sand, pigments, and colouring agents or fillers can be used to change the final colour of the mortar.