What method is typically used to apply permanent hair color?

The most common method for applying permanent hair color is sectioning the hair. This technique involves dividing the hair into manageable sections, which ensures even distribution of the color product and allows for thorough coverage from roots to ends. Sectioning helps the stylist to work systematically, making it easier to apply the color accurately, especially in areas that may require more attention, such as the roots.

By separating the hair into sections, the stylist can also prevent overlap, which can lead to uneven color and damage to previously colored or lightened hair. This method is especially critical with permanent colors, as they are designed to penetrate the hair shaft and change the hair's natural pigment.

The other methods, while they can be used in certain situations, do not provide the same level of control and precision needed to effectively and uniformly apply permanent color. For instance, freehand application might be used for techniques like balayage but lacks the structured approach required for full color application. Brushing can be used for application but might not ensure the color saturates the hair thoroughly or evenly. Fingertip application can work for small areas or detail work but is less effective for large sections of hair.