2 months ago I applied 55/65 koleston perfect to my clients hair, great, both happy with the result. Now she's decided she would like to go back more natural brown. The colour has faded a lot so I was thinking of using a half tube 6/0 with half 6/1. I am over thinking it for some reason tho, will it cover the violet enough?? Will attempt to add pics to assist, along with desired shade......any help or reassurance appreciated.