Is hair colouring good? At the top of your hair from the roots is terrible....It sends the chemicals called Ammonia and Hydrogen Peroxide in through your pores and into your blood stream....Any who if you put it on any area that is 1-2-3 inches away from the scalp it is totally fine. If you decide to put hair colour and it is away from the scalp there is still a side-effect. What will happen is when you dye your hair? It will become dry overnight....So it is important to take care of your hair, so it is nice and smooth.BYE!