Hey
Henna is great! You can lighten henna with Sun In, if it is too dark.
I have little knowledge of colour oops. What I do know is that a copper tint is very hard to achieve with henna if your hair is brown naturally. You'd have to lighten first and then use BAQ Henna for a short period of time.
I have had experience of chemical dye under the henna fading under the henna with multiple washes btw, maybe that is of any help?
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