My color is dark brown, and I want to make it light blond, how do I go about changing my color?

İf you like the products of Loreal you might give this site a try before you dye your hair:http://www.lorealparisusa.com/ .After you enter the site click on the preferences part and then you can choose your natural color and the color you want to dye it to... it gives you the exact code of the color you have to buy.. good luck :D

You need to bleach it if you're going several shades higher. If you're doing it at home, use 9% peroxide. 12% is too strong and harsh.

In order to go from dark to blonde, you will need to bleach your hair to a yellow stage and then apply a toner. Anything other than that will results in a brassy or red/orange shade. Bleaching can damage your hair since it's defusing all pigments in your hair. You should get this process professionally done. A trained stylist may be able to bleach and color hair with minimal damage.