Texas Cosmetology Operator Written ExamChemistryMedium
A cosmetologist observes that a client's hair feels very rough and dull. Upon examining the hair under a magnifying lamp, they notice the cuticle scales are open and lifted. This condition suggests the hair's pH is likely:
- ASlightly acidic (pH 5-6)
- BNeutral (pH 7)
- CHighly acidic (pH 2-3)
- DAlkaline (pH 8-9)
Show answer & explanationAnswer & explanation
Correct answer: D. Alkaline (pH 8-9)
Alkaline solutions cause the hair cuticle to swell and open, leading to a rough, dull appearance. Acidic solutions, especially slightly acidic ones, typically smooth and close the cuticle.
Why the other options are wrong
- A. Slightly acidic pH (like the natural pH of hair and skin) helps to close the cuticle, making hair smooth and shiny.
- B. Neutral pH tends to leave the cuticle in a natural, relatively closed state.
- C. Highly acidic environments can damage hair, but generally cause shrinkage and hardening, not just open cuticles in this manner.
Hair Cuticle and pH
The outermost layer of the hair shaft, consisting of overlapping scales, which swells and opens in alkaline conditions and flattens and closes in acidic conditions.
- Alkaline pH opens cuticle
- Acidic pH closes cuticle
- Healthy hair pH is slightly acidic (4.5-5.5)
Memory trick: Alkaline Lifts, Acids Lock.