You should make sure that you use a good brand of hair colour while colouring your hair. You can opt for brands like Loreal, Schwarzkopf or Wella. You should also make sure that you do not leave the colour on your hair for more than 30 minutes. If left for more than the required time, hair tends to get rough and damaged. Coloured hair should be treated with deep conditioner after every wash. Never brush your hair when it is wet as this can cause split ends, and make sure to always use a wide toothed comb.