L'Oreal Magic Retouch Permanent covers 100% grey root coverage in 10 minutes. This permanent and long-lasting solution for grey roots comes with 2 different applicators for a precise and easy application to target grey hair. Just mix the colour from one easy-to-squeeze bottle to cover 100% of grey roots for up to 4 weeks in one use Magic Retouch Perm Root Conceal - Dark Brown