What defines the heel of an art brush?

The heel of an art brush is defined as the location where the bristles meet the ferrule. This area is critical because it serves as the connection point between the bristles and the ferrule, which holds the bristles in place and provides structure to the brush. The heel plays an important role in the brush's functionality, influencing how it holds paint, distributes color, and allows for variations in pressure and angle during application. Understanding the various parts of an art brush, including the heel, can significantly enhance a nail technician's skill in applying products and creating intricate nail designs.