California Barber Written ExamHair Care ServicesHard
A barber is applying a permanent hair color that requires a 1:2 mixing ratio of color to developer. If the formula calls for 30 ml of hair color, how much developer should be mixed in?
- A60 ml
- B15 ml
- C30 ml
- D45 ml
Show answer & explanationAnswer & explanation
Correct answer: A. 60 ml
A 1:2 mixing ratio means for every 1 part of color, you need 2 parts of developer. If you have 30 ml of color, you would multiply 30 ml by 2 to find the amount of developer needed: 30 ml * 2 = 60 ml.
Why the other options are wrong
- B. 15 ml would be a 2:1 ratio (developer to color), which is incorrect.
- C. 30 ml would be a 1:1 ratio, which is incorrect for a 1:2 ratio.
- D. 45 ml does not correspond to a 1:2 ratio with 30 ml of color.
Hair Color Mixing Ratios
Hair color mixing ratios indicate the proportion of hair color to developer. A 1:2 ratio means one part color to two parts developer.
- Ratio is color:developer.
- First number is color, second is developer.
- Must be precise for consistent results.
- Ensures proper lift, tone, and coverage.
Memory trick: Ratio rules: color first, developer second, multiply correctly.