Hello everybody! Well, I stopped bleaching my hair about a year ago. Since then, I've had several henna applications, only two of which included my (several-inches-long) roots, hoping that the colour of the ends would darken to match the roots.. I was obviously wrong!

http://s1259.photobucket.com/albums/ii559/tsopana25/?action=view&current...

This picture shows the colour difference between the hennaed roots and the hennaed ends.
My natural hair colour is light-medium brown. Therefore I now figured, that if I dye the ends with hendigo, they will start to blend in with the roots.. Is that thought correct? If yes, does anyone have
any idea on what proportions of henna and indigo I should use, since I don't want the result to be
brown, I want it to be auburn..?

Thanks in advance!