I've been using Koleston Perfect permanent hair color for about two years, and I really like the result. This time around, I was going for a light brown/dark blond and mixed Koleston Perfect 7/38 with a bit of 6/0 (although I really wanted 6/1, which is a cooler tone brown, but they didn't have it at the beauty supply).
I mixed the hair dye with Welloxon Perfect 4% (13-volume developer), applied it evenly to my hair, and left it on for 20 minutes. Then, I rinsed it out with cool water and applied a deep conditioner for 20-30 minutes. The colour I came out with is pictured above, and it matched my box braids in color 27 braiding hair perfectly. When I went blond two years ago, a protein treatment every four to six weeks was essential to avoid breakage for as long as I could. So that's definitely something worth investing in.
I hope this helped and you got the result you wanted. If not, it can be fixed at the salon, or you could cut it all off, grow it out, or dye it darker.
