Only indigo will give you green after bleach. After chemical dye, especially when it's a dark color... you won't notice as much ill effects. But still, there is that risk. Whenever peroxide is involved!
BAQ henna? You should be fine, especially more than a month after your last application of a chemical dye.
BUT, always: test strand, especially on the roots of your hair, as that is a different color than the chemical color, and the henna will most likely adhere to the roots differently.
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