NIC Barber Written (Theory) ExamHair Care ServicesHard
A client with 75% gray hair desires a permanent hair color that will provide complete coverage and a vibrant, long-lasting result. The barber has mixed 2 ounces of color formula. According to standard mixing instructions for gray coverage, how much 20 volume developer should be added if the mixing ratio is 1:1?
- A0.5 ounces
- B4 ounces
- C1 ounce
- D2 ounces
Show answer & explanationAnswer & explanation
Correct answer: D. 2 ounces
A 1:1 mixing ratio means for every 1 part of color, 1 part of developer is added. If there are 2 ounces of color formula, then 2 ounces of developer should be added to maintain this ratio.
Why the other options are wrong
- A. 0.5 ounces would be a 4:1 ratio, which is incorrect.
- B. 4 ounces would be a 1:2 ratio, which is incorrect.
- C. 1 ounce would be a 2:1 ratio, which is incorrect.
Hair Color Mixing Ratio (1:1)
A standard proportion used in hair coloring where equal parts of hair color formula and developer are mixed together. For example, 1 ounce of color mixed with 1 ounce of developer.
- Equal parts color and developer
- Common for permanent color and gray coverage
- Ensures proper chemical reaction and result
Memory trick: 1:1 means 'one for one', a perfect balance of ingredients.