Although the Illuminating Shampoo Silver Pearl can be used to neutralize yellow or warm tones, it is most effective to maintain the correct blonde tone in between color services. Apply to wet hair, massage softly and rinse out thoroughly after 3 minutes. Repeat the treatment until the desired result is reached. Due to the permanent brightening effect which can’t be washed out, excessive use is not recommended. Do not use the hair lightener on skin or clothes.