What is the technique of slicing or weaving out a section of hair to place in foil for highlighting?

The technique of slicing or weaving out a section of hair to place in foil for highlighting is best described as the foil technique. This method involves taking selected strands of hair and isolating them with foil to apply a lightening agent. The foil not only aids in the application of the product but also helps to keep the highlighted hair separated from the rest, which can enhance the effectiveness of the lightening process.

In contrast, balayage encompasses a freehand painting technique rather than using foils, allowing for a more natural gradation of color. Ombre refers to a gradient effect where hair is darker at the roots and gradually becomes lighter towards the ends, which does not specifically involve foiling. Chunking involves taking larger sections of hair to create a more pronounced, layered look, which is not focused on the highlighting process specifically. Thus, the foil technique is clearly defined by its use in highlighting with foil for controlled color application.