Florida Cosmetology Licensing ExamChemical ServicesMedium
A client with natural black hair (level 1) wishes to achieve a level 7 (medium blonde) in a single lightening service. What volume of hydrogen peroxide developer is generally NOT recommended for this significant lift in a single application due to potential damage and uneven results?
- A40 volume
- B10 volume
- C30 volume
- D20 volume
Show answer & explanationAnswer & explanation
Correct answer: A. 40 volume
While 40 volume developer can provide significant lift, it is generally not recommended for on-scalp applications or for achieving such a drastic change in a single step due to the high risk of scalp irritation, hair damage, and uneven lift when applied directly to the scalp and hair for extended periods.
Why the other options are wrong
- B. 10 volume provides minimal lift, unsuitable for level 1 to 7.
- C. 30 volume provides 2-3 levels of lift, still likely insufficient for a clean level 7 from level 1 in one step without causing damage.
- D. 20 volume provides 1-2 levels of lift, not enough for level 1 to 7 in one go.
Hydrogen Peroxide Developer Volume for On-Scalp Lightening
The concentration of hydrogen peroxide in a developer, which dictates its lifting power and is chosen based on desired lift, hair condition, and application method (on-scalp vs. off-scalp).
- 10 volume: 1 level lift, toning, depositing only.
- 20 volume: 1-2 levels lift, standard for permanent color, on-scalp lightening.
- 30 volume: 2-3 levels lift, off-scalp lightening, can be used on-scalp with caution.
- 40 volume: 3-4 levels lift, typically off-scalp only, high risk of damage.
Memory trick: Higher the 'Volume', 'H'igher the 'H'eat and 'H'azard to the 'H'air.