How long to wait for highlighting hair?

My friend is wanting to change up her look, and dye her hair a bit darker, and put some highlights in it, but can't afford to get it professionally done. I'm going to help her with it, because I've highlighted my own hair before, but I've heard that if you do it the same day, it can mess up the colors, like screw around with the chemicals or something and wind up green. Is this true? And if so, how long should we wait?


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  • Now highlights or hair coloring you should wait least 4 weeks


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