What is the recommended method of changing the colour of cement please?
I have a few loose patio bricks and the existing cement is a bluish colour. I'll buy a small bag of ready-mixed cement this morning but if I remember correctly it's always either sandy or light grey in colour.
Does it matter much how I do it? Perhaps just mix a few drops of matt or gloss paint from old tins? Or would that seriously affect the stuff's ability to set, or its strength? Are there dyes or something expressly for this purpose?
BTW, how do most DIYers mix the cement with water? I plan to use a large sheet of old hardboard, although last time I recall that some of it washed off onto the lawn despite my efforts.