Excell 10' is the first permanent hair colour from L’Oreal that works in just 10 minutes. It provides rich colour and hair that feels stronger* – fast! Its patented formula develops faster than most classic permanent hair colourants, providing up to 100% grey coverage, mirrorshine colour and cashmere touch. Excell 10 also helps fortify the hair, and has an optimised pH. The Easy Colour Comb allows an easy and precise application. * Used with conditioning balm. 71% agreed: tested on 319 women, strength measured as resistance to brushing.