[ Hair ] Open Question : How can I convince my parents to let me dye my hair?

So I really want to dye my hair black. I'm fourteen and I've wanted to since I was twelve. I don't know for a fact that she wont say no, but I'm really nervous about asking. My dad will be harder to convince, but I'm going to ask my mum first. My natural colour is dark brown, so it's not really a huge change. It's not so much about convincing her to let me dye it black, just the dying itself. Any tips on asking? What can I tell her to win my case?

Source: http://answers.yahoo.com/question/index?qid=20111011125926AAyEk3X

Nicole Richie Justin Bieber Katy Perry