California Barber Written ExamHair Care ServicesEasy
Before performing any hair coloring service, a barber must conduct a patch test, also known as a predisposition test. How long before the service should this test typically be performed?
- A24 to 48 hours before the service.
- B12 hours before the service.
- CWithin the same week of the service.
- DImmediately before the service.
Show answer & explanationAnswer & explanation
Correct answer: A. 24 to 48 hours before the service.
A patch test (predisposition test) must be performed 24 to 48 hours before any hair coloring service to identify any potential allergic reactions to the product's chemicals.
Why the other options are wrong
- B. 12 hours might not be enough time for all delayed reactions.
- C. Within the same week is too broad; 24-48 hours is the specific, required timeframe.
- D. Immediately before is too late to observe a delayed allergic reaction.
Patch Test (Predisposition Test)
A test performed to determine if a client has an allergy to a hair coloring product, required by law and manufacturers.
- Applied to a small, inconspicuous area (e.g., behind the ear, inner elbow).
- Must be performed 24-48 hours prior to service.
- Negative reaction is required to proceed with service.
Memory trick: Patch Test: Plan Ahead, Please!