What term refers to the unwanted mixing of colors during the hair coloring process?

The term that specifically refers to the unwanted mixing of colors during the hair coloring process is "bleeding." This phenomenon occurs when different hair color dyes or products come into contact with one another, resulting in a color that is not intentional. For instance, if a stylist applies a light color over a dark color without proper sectioning or barrier techniques, the darker color can seep into the lighter one, causing an undesirable patchy look.

Understanding the concept of bleeding is essential for hair colorists, as managing this issue is crucial for achieving clean and vibrant results. Proper techniques, such as applying color in sections, using barriers, or even rinsing between applications, can help prevent bleeding and ensure that each color remains true to its intended shade. This concept differentiates it from blending, which is a desired technique aimed at creating a seamless transition between colors.