When you say "mix them yourself" do you mean like the professional stuff from Sally's? I have used the box kind from drugstores and they have worked well for me, but they fade on me when I'm dying my hair darker. My hairstylist told me most store kinds have a 20 volume and you can get 30 volume at Sally's and that they wouldn't fade as much. I'm not sure what color your hair is now, but if you want dark, lasting results, the pro products will probably work better! Just make sure you use a moisturizing color and nothing too harsh on your hair!! And deep condition

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