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You might could use a brass neutralizer which is very inexpensive to buy at salon beauty supply. They have different kinds for different colors depending on what you are trying to neutralize. It cost...

Excuse the typos.

No, you can dye right after but people say it might be better to wait 24 hrs. I use it on my soft black hair color which was then colored med blonde trying to lift. Bi mistake so I used Color Oops....