#3 Use colour shampoo
Colour shampoos are specifically formulated to clean hair without stripping its colour. Certain ingredients containing sulphates (or sulfates) are known to fade hair colour, so avoid using them on coloured hair. Additionally, there are colour shampoos catered for certain hair colours – purple or blue shampoo helps grey hair remain ashy and silver. They can also be used on blonde hair to keep brassiness away.