Is it possible to buy a mortar paint or stain?

I have dark grey ridge tiles on my shed roof but although the builder added dye to the mortar, it has dried lighter than I would have liked. Just wondered if there is a paint on the market and has anyone any suggestions?|||masonry paint will do the job you can have it mixed to the colour you want|||you con darken it down with earth and water it will soon dull down and encourage lichen or moss to grow cows muck and water is even better or natural yogurt