When Should I Use 40 Volume Developer With Bleach?
40 volume developer should only be used with bleach when trying to achieve the lightest possible result or when trying to lift several levels of color. It is important to keep in mind that using 40 volume developer with bleach can be harsh on the hair and can lead to damage if not used correctly. It is recommended to consult with a professional hairstylist before attempting to use 40 volume developer with bleach.