During the lightening and colouring process the hairs PH raises from a gentle acidic PH to an Alkaline PH this causes swelling and can leave the hair feeling weaker and the colour pigments unstable. Magma Color Complete Treatment is designed to return the hair to it's natural PH level, strengthening the hair and stabilising the new pigments for long lasting tonality and increased combability. This provides the ultimate longvity of the tone and gives intense shine.