Florida Cosmetology Licensing ExamChemical ServicesEasy
When performing a patch test (predisposition test) for hair color, where on the client's body should the product typically be applied?
- AOn a small section of hair at the nape.
- BOn the inside of the wrist.
- CBehind the ear or on the inner elbow.
- DDirectly on the scalp at the hairline.
Show answer & explanationAnswer & explanation
Correct answer: C. Behind the ear or on the inner elbow.
A patch test is performed on a small, inconspicuous area of sensitive skin, such as behind the ear or on the inner elbow, to check for allergic reactions to the chemical product before full application.
Why the other options are wrong
- A. Applying on hair at the nape is a strand test, not a patch test for skin sensitivity.
- B. The wrist can be used, but behind the ear or inner elbow are more common and often more sensitive/reactive areas that resemble the scalp.
- D. Applying directly to the scalp is too close to the intended application area and could cause a visible reaction if an allergy exists, defeating the purpose of an 'inconspicuous' test.
Patch Test (Predisposition Test)
A test performed 24-48 hours before a chemical service (especially hair color) to determine if a client has an allergic reaction to the product.
- Required by law for many chemical services.
- Performed on sensitive, inconspicuous skin (behind ear, inner elbow).
- Checks for signs of inflammation, redness, itching, burning.
- Must be done 24-48 hours prior to service.
Memory trick: Behind the Ear, Clear the Fear