However, regardless of the amount of care you take, your hair colour will gradually start to fade, and you will need touch-ups sometimes (less frequently if you have highlights). However, if you take good care of your hair, especially after colouring it, both the colour and the health of your hair will benefit. Avoid the pool as much as you can since the trace amounts of metal in your freshly coloured hair might react with the chlorine in the pool's water and transform the colour into something unfavourable.