Alternatively the concrete may be coloured using an Integral Colourmix which is added to the concrete while it is in the lorry and mixed thoroughly. This is then laid as normal concrete in Ireland. This product colours the concrete slab throughout but does not harden the surface. Our Integral Colourmix is available in water soluble bags – 1 per cubic metre. Integral Colours are manufactured to suit the cement content of the concrete mix being used. These are available in 24 different colours.