When the woman mentioned your hair being a number 3 or a 2 she meant the color of your hair. Here's a little explanation I posted as a reply to someone else that might help you out.
The volume of the developer indicates how many shades the hair dye will lighten your hair. A 20 volume developer can only make your hair 2 shades lighter, a 30 volume developer can only make your hair up to 3 shades lighter, and so on.
Color is categorized by numbers, 1 being the darkest and 10 the lightest (though it can go as light as 12).
1 - black, 2 - darkest brown, 3 - dark brown, 4 - medium brown, 5 - light brown, 6 - dark blonde, 7 - medium blonde, 8 - light blonde, 9 - lightest blonde, 10 - platinum blonde (almost white)
You say the color you chose was B51, the 1 indicates that it's an ash color (brown is the color of your hair, and ash is the reflection your hair will have). So in other words, 51 is a light ash brown. The B is probably used to help consumers see that it's a high-lift dye. Any number that comes after the first is simply indicating the reflection your hair will have (or at least should have).
1 - ash, 2 - silver, 3 - golden, 4 - copper, 5 - red violet, 6 - red
So, say you want a medium golden brown, you would opt for a 53. Of course the end result also depends on your starting haircolor. If your hair is black, it could be either a blue black or a red black. If you want a golden tone to it and your hair is blue black, you should stick to golden tones, however, if you don't want a golden effect and your hair is red black, then you should stick with ash colors.
I really don't think you have to bleach your entire hair to get that blonde. You would need the right products though, since your friend is finishing beauty school she probably knows best (and has access to quality products as well, though e-bay has sellers too), so do ask her. Nowadays hair dyes technology is so good, that you can make a dark brown hair like yours (level 2 or 3) to a lightest blonde (level 9) without even having to bleach it first (at least that's what I saw a hairdresser say, haven't seen it happen yet). From what I could tell from the picture, I think your hair is either a number 3 or a 4 (go to any store that sales hair dye and has those little pieces of hair to show what the color is supposed to look on hair, then compare it to your natural haircolor to know more accurately). Here's a little article on Hollywood blondes and how they achieve beautiful, blondest hair, hope it helps. Good luck. ^^
http://www.eonline.com/Gossip/Answer/index.jsp?fdnavgos2 - http://www.eonline.com/Gossip/Answer/index.jsp?fdnavgos2
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