The Yardlie Hair Color Shampoo in Dark Brown (200ML) is an all-in-one product designed to color hair and provide grey coverage with the convenience of a shampoo.1Here is a summary of its key features, benefits, and usage:Key Product FeaturesFeatureDetailProduct TypeHair Color Shampoo (often in a dual-chamber bottle)ShadeDark BrownSize200MLFormulaUK-Based Formula; Pre-prepared productFree FromAmmonia, Sulphate, and Paraben FreeCoverageAdvertised as 100% Grey CoverageLongevityColor is stated to last up to 4 weeks