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I just bought it too for the same reason I read loads of reviews first and the common consensus was that it stinks of eggy farts, you might end up a bit ginger and that you can't use another permanent colour for 4 weeks afterwards. I've got a temporary colour to use straight away in case it looks worse (would be hard as I'm like Winnie the Witch now)
Rinse for longer than you think is needed. Use a timer and keep rinsing for all of the ten minutes or however long it tells you to. I've heard others have better success when they rinse for 10 minutes, then partially towel dry and rinse again for another 10 minutes. Colour before works by shrinking the dye molecules and the way to get rid is all in the rinsing.
You can use dye straight away after using colour b4, it is just advisable to leave it a few days in case any remaining dye reoxides. If you dye straight after and haven't rinsed enough, the new dye and old dye will darken and develop together and end up with a different colour than you wanted.
You can also use colour b4 up to 3 times in a row if you have many layers of dye build up, just make sure you do some deep conditioning afterwards.