Colour build up is any artificial dye that has been placed on your hair. Until that hair has completely grown out it is likely that it will remain on the hair and can affect the colour outcome. Some clients it will take up to a hair to achieve a complete colour removal. When cleansing colour your hair will got through various stages of colours, you may see red, orange, brassiness and copper. Once you have your first colour correction appointment we can usually give you a rough timeline for your colour in the future.