Hi, I wonder if someone can help I have brown hair which naturally has a bit of red to it, I have an all over tint of Special ash blonde (12/1 koleston perect) with 12%, it always gets left on for 50 - 60 mins but what is bothering me is sometimes it comes up perfect but sometimes the roots are gingery and you can see the banding ( I know all these terms from the hair students when I was at college lol ) I dont get why it would be fine one time but then not the next if it is the same product left on for the same time ?