this is one of the hardest that i found to get really consistant color all over my hair some parts were really dark blue some parts ended up being a really light blue. i tried leaving the dye on for about two hours and this did the trick it got all of my hair to a really dark blue and after a few washes it got it to the shocking blue that i was looking for. when it fades it starts to turn green and fades patchy.. atleast for me. -Klargo-