NIC Cosmetology Written (Theory) ExamHair Care and ServicesHard
A client has very dark, resistant hair and desires to achieve a significantly lighter blonde shade. The cosmetologist performs a decolorizing service. Which of the following is the most appropriate developer strength to use for this service to achieve maximum lift?
- A40 volume peroxide
- B10 volume peroxide
- C20 volume peroxide
- D30 volume peroxide
Show answer & explanationAnswer & explanation
Correct answer: A. 40 volume peroxide
For maximum lift on resistant, dark hair during a decolorizing service, 40 volume peroxide is typically used. It provides the strongest lifting action, but requires careful monitoring due to potential damage.
Why the other options are wrong
- B. 10 volume peroxide is typically used for depositing color or achieving minimal lift.
- C. 20 volume peroxide provides 1-2 levels of lift and is standard for permanent color, but insufficient for significant lightening on dark, resistant hair.
- D. 30 volume peroxide offers more lift (2-3 levels) than 20 volume, but 40 volume is needed for maximum lift on resistant hair.
Developer Volume & Lift
Developer volume indicates the concentration of hydrogen peroxide and its ability to lift natural hair pigment.
- Higher volume = more lift.
- 10 volume: deposit only/minimal lift.
- 20 volume: standard lift (1-2 levels).
- 30 volume: stronger lift (2-3 levels).
- 40 volume: maximum lift (3-4+ levels), for resistant hair.
Memory trick: The higher the number, the higher the lift, but also the higher the risk.