Tressa's Watercolors Intense Shampoo refreshes, maintains, and intensifies direct-dye color for a deep, on?tone finish while staying safe for all hair types. Working at a balanced pH of 5.35.8, it delivers noticeable results in a simple 3?minute shampoo?and?rinse routine, with three straight uses helping color look longer-lasting and a weekly wash helping slow fade.Biodegradable and made from raw materials sourced from renewable plant materials, the formula supports frequent shade changes without compromising hair integrity. It is free of sulfates, salts, peroxide, parabens, PPD, and PTD, and comes in vivid shades designed to keep color looking fresh, saturated, and even between salon visits.