O.k. I've been living with highlights/LOWlights that are just too drab and ash for my liking. My hair looks o.k. when straightened but when I wear it natural (curly frizz) it looks like shite. It's what I asked for (close to my natural color). Blah. My sister suggested peroxide in my shampoo?? TO lighten it some. I added it and will shampoo tomorrow. Any warnings?