Texas Cosmetology Operator Written ExamHair Care ServicesMedium
A cosmetologist is performing a hair coloring service on a client who has 50% gray hair and wants to achieve a vibrant, permanent red color. Which volume developer should generally be used to ensure adequate gray coverage and deposit of the desired tone?
- A20 Volume
- B30 Volume
- C40 Volume
- D10 Volume
Show answer & explanationAnswer & explanation
Correct answer: A. 20 Volume
For permanent hair color, especially when covering gray hair, 20 volume developer is typically used. It provides enough lift to open the cuticle for proper color deposit and ensures excellent gray coverage while achieving the desired tone.
Why the other options are wrong
- B. 30 volume developer provides 2-3 levels of lift and can be too strong for simple gray coverage, potentially causing more damage and fading.
- C. 40 volume developer provides maximum lift (3-4 levels or more) and is generally used for strong lightening, not typically for standard gray coverage with a vibrant deposit.
- D. 10 volume developer is used for depositing color without significant lift, often for darker results or toning, and may not fully cover resistant gray.
20 Volume Developer
A hydrogen peroxide solution commonly used with permanent hair color to achieve 1-2 levels of lift and optimal gray coverage.
- Standard for permanent color applications
- Opens the cuticle for color penetration
- Ensures good gray coverage and tone deposit
Memory trick: 10 for Tone, 20 for Gray and Grow, 30 for Lift, 40 for Max Glow.