North Dakota Cosmetology Practice Exam 2026 – 400 Free Practice Questions to Pass the Exam

The term "overlapping" in hair coloring specifically refers to the technique of applying color over previously colored hair. This practice can lead to various issues, including potential damage to the hair structure, uneven color results, and an increase in porosity in areas where color has been previously applied. The reason it's crucial to avoid overlapping in certain scenarios is that it can cause the hair to become overly processed, leading to breakage or unwanted tones due to the buildup of color and chemicals.

In contrast, mixing colors to achieve a new shade involves blending different pigments to create a different hue, which does not inherently carry the risks associated with overlapping. Using multiple shades in one application usually refers to techniques like balayage or highlights rather than the overlapping of previously applied color. Layering different products on top of each other is more about product application rather than how color interacts with previously colored hair, which is a separate concept. Overlapping is a precise act that needs to be understood well by professionals to maintain the health of the hair while coloring.