Here's why:
* Green tint is tricky: Green tones are very difficult to neutralize. They are often a result of underlying yellow pigments in the hair that have been over-processed.
* Darker dye may not be strong enough: Even a permanent dark brown dye might not have enough pigment to fully cover the green. It could result in a muddy brown or an uneven color.
* Color may fade unevenly: Due to the damaged hair from bleaching, the new color could fade unevenly, making the green tint reappear.
What you can do:
* Consult a professional: A stylist can assess your hair and recommend the best course of action, possibly involving a color correction process.
* Use a color remover: Before dyeing, try a color remover to remove as much of the green as possible. However, this can further damage your hair.
* Use a color-depositing conditioner: A purple or blue-toned color-depositing conditioner can help neutralize the green tones temporarily, but it won't be a permanent fix.
It's important to remember: Bleaching and dyeing your hair can damage it. If you're unsure, it's best to seek professional advice from a hairstylist to avoid further damage and achieve the desired result.