Well, my hair are black as I am indian, but the roots about 2" are white and to cover them I started using this black hair colour. But it looks too dark now and now I want to do light maybe brown. That is why I needed expert opinion how to remove this black color and can I color hair to brown?

"Color won't lighten color" is what you often hear in the color industry. If you want to go lighter, you'll need to use color remover first, and then dye it lighter.

ColorFix, Color Zap, Color Oops, and Igora Phantom are the products of choice.

Here are some instructions for using ColorFix:

Hair Color and Hair Care by Robert Craig Salon Products, Ltd. (http://www.robertcraig.com/php/index.php?location=colorfix)