Cool you will need concrete technical to do that and I will give you all my technical experience. "Concrete is grey and wet and it goes hard" Remember that and you will go far
Sort of its a tinting powder that you chuck into the truck at a set dosage. The red concrete at cribbs causeway McDonalds is ours. It's ****ing awful stuff to get on you mind, just a little bit takes ages to wash of as when mixed with water it spreads.
Yeah learnt about that last year, can't remember the name of it but in Germany they invented something that when you add to plaster and apply, when it sets its like purple glitter, looked quite good