Hair color is the rage. Why? Baby-Boomers. There are more people in the US with gray hair than ever before in history. There are several ways to cover the gray:
1. With Permanent Color- Most permanent color uses peroxide (10 to 40 vol.) and ammonia. It covers gray the best. The draw back is regrowth of new hair. It is a different shade and will leave a line of "demarcation."