I've read the instructions in the box, but am getting confused. It does say that you can recolour your hair immediately, but it also says you should wait at least a week. What did you do when you used it?
I have home-coloured hair, naturally dark brown, and have been dyeing it to cover grey. I started off using permanent colour, but it was either too dark or too red. Last time I used a semi-permanent colour, which was better, but my hair grows quite fast, and I think you can see the difference between where the semi colour is on my natural roots, and the permanent colour bit. I want to remove the permanent colour, and try again with a semi (medium ash brown, so hopefully they'll be no red in it).
The thing is, I've got a big weekend coming up, and because my roots are showing though, want to recolour tomorrow. Could I use the colourb4 tonight, and colour tomorrow, or should I try to hold off doing anything until after the weekend, and leave it a week before redyeing? I'm also a bit concerned that the colourb4 may leave my hair a different colour (well, that would be the dye, but using the colourb4 would show it), and if I leave it a week before redyeing, could have an interesting week at work in the middle.
How did you find using it?