My hair has a dramatic looking gray streak near the front. A friend suggested that I use a shampoo that brings out the silver in gray hair. I bought Clairol Shimmering Lights Professional Shampoo. The shampoo is a deep purple color In the directions on the shampoo it says to leave it on for 3 to 5 minutes for maximum shimmer. My daughter said if I leave it on that long it'll turn my hair blue. I don't want blue hair! Has anyone used this shampoo or something similiar?