I have a cut and blow client who colours her own hair ( box colour ) at the mo she's made a right pigs ear of it !!! She's 100% white with 1 inch re growth, then a band of red, a pinky red, then it continues on to roughly a 66/45 then on to a flat 4 ! Nice eh ! Now she want me to colour it to approx a 5. Now she's not prepared to have it stripped, she just wants for me to apply to roots each time so it can steadily grow out. Would you advise just popping in a 5/00 koleston ?