What are skin allergy tests for hair dye?
Author: I read all the time that you should perform a skin allergy test 48 hours before dyeing your hair. What does that mean? What is the test like?
I read all the time that you should perform a skin allergy test 48 hours before dyeing your hair. What does that mean? What is the test like?
You just put a tiny amount of the dye on a patch of your skin and see if you have a reaction to it. If you itch, swell up, or have some other response then you are allergic and shouldn't use it. The 48 hours is in case you have a delayed reaction.