Final answer:
It is false that a patch test is not needed for semi-permanent hair color; a patch test is recommended to check for skin reactions or allergies. Semi-permanent color adds pigment, while bleaching removes the hair's natural pigment and is permanent.
Step-by-step explanation:
The statement is false. It is always recommended to do a patch test before using any semi-permanent hair color, even though it is less likely to cause an allergic reaction compared to permanent hair colors.
This precaution is important in order to check for any potential skin reactions or allergies.
Remember, semi-permanent hair color cannot lighten hair; it only adds pigment. On the other hand, bleaching is a permanent method that removes natural pigment, thereby lightening the hair.