Available in versions: - 10 volumes (3%) to darken a tone and coloring bleached hair ; - 20 volumes (6%) for tone -on-tone color, cover gray hair, lighten a tone ; - 30 volumes (9%) for bleaching medium, 2 or 3 tones ; - 40 volumes (12%) to strong bleaching, 3 or 4 tones. box: 1000 ml bottles.