EcoColors may be used on top of most permanent haircolors, but application on a previously colored head is specific.Please call Eden for a color suggestion at 1-877-852-4515 or on Skype at 1-404-448-1114.Always do a strand test and an allergy test according to the kit directions before applying any new colorant to your entire head. Also be sure to read the instructions in the Home Kit on how to color previously colored ends.