Missouri Barber Practice Exam 2024 - Free Barber Practice Questions and Study Guide.

Temporary hair color does not require a patch test before application because it does not contain the same harsh chemicals found in other hair dyes. Permanent, semi-permanent, and demi-permanent hair colors all contain a developer and other chemicals that can cause an allergic reaction. Therefore, these options would require a patch test to ensure the product is safe and will not cause harm.