Why Did My Hair Turn Black After Dying It Red?
This could be due to the pigments in the red hair dye fading quickly or the hair being bleached beforehand, causing it to become porous enough to absorb the black dye molecules. It is also possible that the black hair dye was mistakenly applied or too much was used. In any case, it is important to consult with a professional stylist to determine the best course of action for achieving the desired hair color.