What does "level" refer to in hair coloring?

In the context of hair coloring, "level" primarily refers to the lightness or darkness of a particular hair color. Hair color is categorized on a scale, with levels ranging typically from 1 (black) to 10 (lightest blonde). This scale allows colorists to determine the appropriate shade needed to achieve a desired look. Understanding levels is crucial for creating accurate color results, as it helps in selecting the right dye or bleach and predicting how a color will develop based on the hair’s existing shade. This concept directly influences color formulation and technique, ensuring that the final outcome aligns with the client's goals.