Revlon Professional Revlonissimo Colorsmetique in the 2.10 Blue Black shade is a 60ml permanent colour creme for professional use. It delivers a deep, cool-toned black with a subtle blue reflect and lasting shine. The formula fills the hair fibre with pigment for an even, natural-looking result and grey coverage of up to 100 percent. It is mixed 1:1.5 with Creme Peroxide before use, and an allergy alert test should always be carried out before each application.