North Dakota Barber Practice Exam

What does the "10-20-30" color formula refer to?

1. The types of haircuts

2. The amount of shampoo to use

3. The volume of developer used with color

4. The colors used in highlights

The correct answer is: The volume of developer used with color

The "10-20-30" color formula specifically pertains to the volume of developer used with hair color. In hair coloring, the numbers represent the different strengths of hydrogen peroxide in the developer, which are crucial for achieving various levels of lift or lightening when applying color to hair. Using the correct developer volume is essential for the desired outcome in a coloring process. For instance, 10 volume developer typically allows for minimal lift (approximately 1 level), making it suitable for deposit-only colors. The 20 volume developer offers a moderate level of lift (about 2 levels) and is often used for standard hair coloring. The 30 volume developer is stronger and provides a higher lift (around 3 levels), which can be beneficial when seeking to lighten the hair significantly or when using high-lift color products. While the other options might seem relevant in a broader context of hair care and styling, they do not specifically relate to the established "10-20-30" color formula that is focused entirely on the volumes of developer used with hair color processes.