Send a snippet of your hair to the Ecocolors Salon and they can match the color and email you a formulation. Be sure to either include a self addressed stamped envelope for a return of the colored snippet, or just and email so we can email you the results. Make sure you cut a piece with enough hair to accurately see the color. If you cut a small piece from behind the ear at the root, they can see the root color. Ecocolors Salon Swatch Dept 1860 N Rock Springs Rd #101 Atlanta GA 30324 Medium ash brown is a 6V. Always apply equal parts color to developer at the roots. Then dilute the remaining color/developer mixture by half with water to apply to the previously colored ends for the last ten minutes of processing time.