I color my hair and it's been a very light brown. I just had it colored again and went darker, however, it's not dark enough and I don't want to pay to have it done again. Is there a good shampoo that will darken colored hair? Do you have to use it every time you shampoo or can you skip a shampoo or two and use something else? If you stop using it after awhile, will your hair go back to the color it was before using the shampoo? Thanks for any info!
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