Easy application, has top speed SUC (speed up coloring) technology that gives quick coverage to grey hair in just 5 minutes, ammonia free, has threonine and hydrolyzed keratin and hence gentle on hair. Has professional retouch brush so that new born gray hair can be retouched easily and whenever needed. Permanent hair color that ensures 100% grey coverage. If you want a hair color that works on your hair colors hair and covers grey hairs in five minutes, then revlon top speed hair color is the perfect option for you. This hair colors is one of the best among all the hair colors available in the market as this is ammonia free.