Texas Class A Barber Written ExamChemical ServicesHard
A barber is performing a full head highlight service using foils. After applying the lightener, the barber notices that some of the foils are beginning to swell and leak. What is the most likely cause of this issue?
- AThe lightener was applied too sparingly, causing it to dry out
- BThe lightener mixture was too strong or applied to overly damp hair
- CThe foils were not folded correctly, allowing air to escape
- DThe lightener was not mixed thoroughly enough
Show answer & explanationAnswer & explanation
Correct answer: B. The lightener mixture was too strong or applied to overly damp hair
Swelling and leaking foils are often caused by a lightener mixture that is too strong (e.g., too high a volume developer for the hair type) or by applying lightener to hair that is overly damp, which dilutes the lightener and can cause an exothermic reaction.
Why the other options are wrong
- A. Lightener drying out would slow or stop processing, not cause swelling or leaking.
- C. Incorrectly folded foils might allow leakage, but not swelling, which indicates a chemical reaction.
- D. Improper mixing can lead to uneven processing, but not typically swelling/leaking foils.
Lightener Swelling/Leaking Foils
Swelling or leaking foils during lightening usually indicate an overly strong lightener mixture or application to overly damp hair, leading to excessive heat and gas production.
- Exothermic reaction
- Can lead to scalp burns or hair damage
- Always follow manufacturer instructions
Memory trick: Swelling foils mean 'Strong' mix or 'Soaked' hair.