How long does the colour last and what factors influence the result?

The tinted shampoo deposits semi‑permanent pigments that typically last through 4–8 washes, but the exact duration depends on several variables. Hair porosity is a major factor: more porous strands (from bleaching, heat styling, or chemical treatments) absorb pigment more deeply and may retain colour longer, but they can also take up the shade unevenly, leading to a more intense or patchy result. Your natural or previously coloured base shade also matters — lighter bases show the deposited tone more vividly, while darker bases may only gain a subtle nuance. Frequent washing, especially with clarifying or sulphate‑heavy shampoos, accelerates fading. UV exposure, swimming in chlorinated water, and regular heat styling also strip the surface pigments faster. Because the product contains no oxidants, the colour cannot become permanent; it is designed to wash out gradually. For a predictable outcome, do a strand test on a hidden section first, follow the recommended leave‑on time on the package, and rinse with cool water to help seal the cuticle.