I would like to have an overall med. reddish brown color of hair. My problem is that my natural med. brown hair is now about 95% gray, is very resistant to color, and I have to use med. ash brown on my roots to keep them from looking unnaturally redder than the rest of my hair. But I don't want an overall color of med. ash brown. How can I use your products to cover my gray roots (without the red) and still have a nice overall reddish brown color. Obviously I will have to put one color on the roots and then some diluted mixture of brown on the rest. What do you suggest.