The rich and highly nourishing emulsion contains hydrolysed keratins to fill structural gaps in the hair, from the outer layer to the cortex.pH 4.5 Balancer Technology tightens the hair structure and locks colour pigments into the deepest layers of the hair, while improving the strength and elasticity of coloured hair. Hair is brought to optimal pH 4.5 colour, appearing as vibrant as on day one, until the next salon visit.