He he!

O.K so I have decided to go back to brown from a deadset platinum bob. I have about 2 inches of mousy blonde regrowth. Obviously I have a great collection of HATS, but I can wait no longer.....

I am going to throw in a cool brown semi permanent tonight and I was wondering the best way to go about it.

Should I put in extra over the blonde? I totally understand this could be a disaster, and it's only semi permanent. The blonde is still in pretty good condition, but I know it will probably suck up the colour more than the rest. I intend to keep it short (a-la Victoria Beckham), and keep chopping out the over-processed bits until its all gone - but does anyone have some tips when it comes to adding the dark?

Thanks in advance!