My friend at school told me that she used equal amounts of shampoo and/or conditioner with unsweetened hersheys cocoa mix to her hair and rinsed till it was clear. I dont know if it works or not because I havent done it but she does it all the time and her hair is a shiny brown.
They also sell John Frieda hair products specially formulated for brunettes.
Drop me an email at: [Email address removed as per site policy. - AB Editor]with more specific questions and I will give you a hand.
I'm a qualified hair and make up artist :)
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