The best and easier solution to this is to do a test on a small, inconspicuous area of your hair. Take a small, 1 inch strip of hair somewhere discreet and apply the hair coloring as you normally would. The time can go anywhere from 10 - 40 minutes depending on your hair color, The longer the time, generally, the darker the color. After you have determined how long is required for the color you want, simply apply the coloring to your roots liberally and comb into the rest of your hair.
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