What is the effect of overlapping color applications on previously colored hair?

The correct response highlights that when color is applied over previously colored hair without proper technique, especially if the new color overlaps onto the previously applied color, it can lead to bleeding. This occurs because the color molecules can become too saturated in the layered areas, especially if those sections have been previously lightened or colored multiple times. As a result, the colors may become more pronounced than intended, leading to an uneven or undesirable outcome.

Overlapping color applications can disrupt the color balance and may lead to unintended darkening or color distortion. Understanding how color interacts with existing pigments is crucial to achieving the desired results and maintaining hair integrity. Proper technique, such as applying color strategically to avoid direct overlap, is key to preventing these types of issues.