It might take a couple of goes before you find the right amount of time to leave the colour in.
I was happpy with the colour I ended up with but not how long it lasted. I ended up getting it done at a salon, and they were able to match my hairpiece that covers my MPB perfectly. Lot cheaper if you can do it yourself though.
Just think, women have been having fun changing their colour for ages, and we never knew about it!
Karen.