Using a Flat Iron on Highlighted Hair

Can you straighten your hair a day after getting it highlighted and without washing it either? Or will it fade the colors?

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If you are talking about using a flat iron, your hair should be fine as long as you don't have the heat turned up too high. Your hair color shouldn't fade if its been done professionally.

Its still not the best idea to do this however, until you've washed and conditioned your hair. Waiting a few days to straighten your hair shouldn't be that big a deal.