I am 58 years old and have dark blonde/gray/white hair that I have colored in a two-step process. First, all of my hair is colored a neutral blonde to cover the gray/white. Next I have a full head of foil highlights put in. This is time-consuming! We live in the country and we have well water. My colorist was horrified to see my "green" hair caused by the copper in my water. She put a Malibu C treatment on my hair before she colored my hair and I could hardly believe the green/grayish gunk that came out of my hair! Lamphier Spa in Darien, Connecticut recommended Malibu C and my hair looks much better, feels softer, and does not have that unflattering "greenish" hue anymore!