What technique is used to add highlights to hair?

The technique utilized to add highlights to hair is foiling. This method involves placing sections of hair between sheets of aluminum foil before applying a bleaching or coloring product. The foil not only helps to isolate the strands being highlighted but also accelerates the processing time by retaining heat. This approach allows for precise control over the amount and placement of highlights, resulting in a more dimensional and natural look.

Combing is primarily a method for detangling or styling hair and does not directly contribute to the highlighting process. Blow-drying is a styling technique used to dry and shape hair but is unrelated to the application of color. Cutting involves shortening hair and shaping it, which does not add color or highlights. Therefore, foiling remains the most effective and commonly used technique for achieving highlighted hair.