Hi, I have a client who wants to get rid of her money piece by taking it to a base 5 or 6 with a mushroom hue to it. I am used to prepigging but am a little concerned that the warmth from that will be visible or that if I cool it down to much it will look sludgy. I use wella colours, if I pre pig then go with 6/77 + 6/1 + 3% would that work ( I would then tone the rest of the hair with the same colour to even the colour through) would this work, any suggestions please?