You can try mixing Ecocolors Black with EcoColors Dark Ash brown. Be sure to apply the color full strength to the roots only(equal parts color and developer) and let it process 30-45 minutes. The last 5 minutes of processing time, take the remaining color mixture that you used to color the roots and dilute it by half with water to apply to the previously colored ends. Letthat process thelast five minutes of processing time. BEFORE you attempt this, do a strand test and an allergy test according to the kit directions before applying any new color to yourentire head.This way you will besure thatthe color mixture is the correct tone for your hair.