1. Can't. It doesn't make sense the other way and if you listen closely, you can just hint that little 't' sound. Very hard to define though!!
2. VERY good point! I never realised that. The whole different colour thing of course good be in theme with the different colours of the rainbow, black and white?
I personally think because maybe in the colour spectrum, you can all these colours, and if you were one of them, you'd be like, in the middle of it all? But white sort of means the lack of colour, and black means all of the colours, so in a way, white can resemble the start, and black can resemble the end. I guess in a way it is like saying, now that I have found inner-self peace, I am at the end of the grey, unsure area (the different inbetween colours), so I'm black, but I'm also white because this is a start of a whole new way of life.
My theory ^_^ Or maybe she just looks pretty in black and white
