Unique cool blondes Préférence Cool blondes with light-reflecting dyes for a bright and refined color. Ultra cool and bright blondes are enriched with ash and pearl tones and a mask against copper reflections. The formula with the consistency of a transparent gel gives the hair a blonde shade with cool reflections, increasing the intensity of the natural accents of the hair color. The nourishing mask enriched with violet dyes neutralizes yellow and copper reflections week after week. The effect lasts up to 6 weeks! Optimal coverage of gray hair.