How long should you wait to color your hair after a relaxer using semipermanent hair color?

Usually it is best to wait at least 14 days. Relaxing the hair is such a harsh chemical reaction that the hair is easily damaged. Waiting 14 days will help prevent breakage. It is also important to do a strand test each and every time you use a relaxer or a hair color, as Allergies can literally develop overnight. Typically do the strand test 2 days in advance to ensure that you aren't going to have immediate symptoms such as respiratory difficulty or symptoms over time such as a rash. Some hair colors and relaxers will vary. Check the insert that comes with home kits or check online for the product information that you plan on using.