Which of the following methods is commonly used for hair color application?

Foiling is a widely used method for hair color application that involves placing color in specific sections of hair using foil sheets. This technique allows for greater precision and control over the placement of the color, making it ideal for achieving a variety of effects, such as highlights or lowlights. The foil helps to separate the hair strands being colored from the rest of the hair, which prevents the colors from bleeding together and allows the color to process evenly.

In addition, foiling can create a more dramatic contrast by allowing the colorist to apply different shades and create depth within the hair. It is particularly effective for clients who seek a well-defined, multi-dimensional look.

Other methods mentioned have their unique qualities, but foiling is particularly recognized for its efficiency and versatility in achieving specific coloring goals, making it a popular choice among professionals in the cosmetology field.