California Cosmetology Written ExamHaircoloringEasy
Before applying a permanent color formula to a client's entire head, a cosmetologist performs a strand test on a small section of hair. What is the primary purpose of this test?
- ATo preview the resulting color and lift, and confirm the correct processing time before full application
- BTo determine whether the client is allergic to the color product
- CTo detect the presence of metallic salts in the hair
- DTo measure the pH balance of the client's scalp
Show answer & explanationAnswer & explanation
Correct answer: A. To preview the resulting color and lift, and confirm the correct processing time before full application
A strand test verifies how the formula will process on the client's actual hair—predicting final color result, lift level, and processing time—before committing to a full application.
Why the other options are wrong
- B. Allergy testing is done with a patch/predisposition test, not a strand test.
- C. Metallic salt detection uses a specific chemical test, not a standard strand test.
- D. pH testing is a separate diagnostic step, not the purpose of a strand test.
Strand Test
A preliminary test applying color to a small hair section to preview color result, lift, and processing time before full application.
- Performed on a discreet section of hair
- Confirms accurate processing time
- Prevents unwanted color surprises on the full head
Memory trick: Strand test = 'sneak preview' of the final color.