1) Apply the appropriate Kérastase Bain to wet hair. Rinse. 2) Using the spatula, fill the CHRONOLOGISTE bowl with the rich CREME CHRONOLOGISTE up to the mark (approximately 20 grams). Adjust the amount of crème according to the length of hair to ensure overall distribution. 3) Add 10 pumps of PERLES CHRONOLOGISTE into the bowl. 4) Mix using the spatula (no need to attain an even pale grey mixture) 5) On towel-dried hair, part the hair, apply and massage the treatment section by section to the scalp, lengths and ends. Leave on for 5 to 10 minutes. 6) To rinse, add a little water to the hair to create a lather and massage through the hair like a shampoo. Then rinse thoroughly to ensure that all traces of the pearls have been rinsed out. 7) Rinse the CHRONOLOGISTE bowl for the next application. 8) Style as usual.