Product Description For Professional Use Only. An ammonia-free semi-permanenthair colour that provides tone on tone customizablehair colour, to tone highlights and leave hair with added shine. The Dia-Light range is perfect to refresh colour or top up vibrancy on clients in-between permanent colour services. Features: Ammonia-free Acidic Zero lift Darkens up to 2.5 levels Provides 6 weeks of lasting, durable colour Ideal for hair with less than 30% grey/white hair. Mixing Ratio:1:1.5