California Cosmetology Written ExamHaircoloringHard
A cosmetologist is performing a retouch application on a client with previously colored hair. Why is it important to apply color only to the new growth and avoid overlapping onto previously colored hair?
- ATo use less developer overall
- BTo prevent line of demarcation and reduce risk of damage/breakage
- CTo save time during the service
- DTo ensure the color processes faster
Show answer & explanationAnswer & explanation
Correct answer: B. To prevent line of demarcation and reduce risk of damage/breakage
Overlapping color onto previously colored hair during a retouch can cause excessive processing, resulting in damage, breakage, and a noticeable band of darker or different-colored hair (banding), so color should be applied only to new growth.
Why the other options are wrong
- A. Developer amount is unrelated to the reason for avoiding overlap.
- C. Time savings is a side benefit, not the primary safety reason.
- D. Processing speed is not the concern; damage prevention is.
Retouch Application
Applying color only to new hair growth near the scalp during subsequent color services to avoid overlapping onto previously colored hair.
- Prevents overprocessing and breakage
- Avoids banding/line of demarcation
- Typically done every 4-6 weeks as new growth appears
Memory trick: New growth only - don't repaint what's already painted.