Here are some things that you need to know about the rainbow hair colors. First of all, you need to know that you have to bleach your hair in order to prepare yourself. Number one is equal to black and 10 is platinum on the hair dye scale. This is the information that you need to take as a basis in the event that you are a brunette woman. You need to be sure that you have already bleached your hair to number six which is the darkest shade of the blonde hair color. This is why in the event that you are worried about damaging your hair or do not like the result at the end, then forget about applying the trend to your whole hair. You can prefer this trend in the form of different hair coloring techniques such as ombre and balayage.