Hi I had dark brown really long hair and now more than 30% is gray. The gray was so resistant to color tuch so I started to use koleston perfect with 6% oxy in the past 2-3 years. I always preferd the violet undertones, maybe that the reason my hear just looks darker and darker. Now I use level 5 and my hair looks so dark brown its almost black. I really would like to achieve a lighter brown, some nice middle brown. Do I need bleach or just use stonger oxy? Thanks for your help!! Eszter