For the most vibrant result, apply to pre-lightened hair. Pre-lighten with XP200 Dust Free Blonding Lightener (not included) to the desired level of lift. It is important to note that the degree of lift achieved with pre-lightening will directly affect the vibrancy and intensity of the final result. Underlying exposed contributing pigment must be taken into consideration. If the hair is orange or a dark yellow this will contribute to the final color. To achieve a boldly intense XP200 Brights colour, pre-lighten to the level indicated in the table below for each specific color. After pre-lightening, shampoo, then dry the hair. Apply chosen XP200 Brights shade directly on dry hair and process for 20 to 40 minutes depending on the level of color intensity desired. Strand test every 5-10 minutes. Heat is not necessary for processing if the hair has been pre-lightened. After processing, thoroughly rinse and apply XP200 pH Normalizer After Color Treatment to close the cuticle and lock the color deep inside the hair. Requires a patch test 24-48 hours before application.