Bleach the roots at 6 percent
Apply toner mixed with Indola Pearl (white) and a little part Blue to darken and pigment the bleached roots. On the midlengths and ends, tone only with Pearl.
Blow-dry hair completely dry.
Color the roots with Blue (it will be darker with the previous shade). Comb the color to degrade to next step.
Color the mids with the same Blue (it will be more clear). Color the ends with Pearl. Massage the hair where the two colors meet.