Final answer:
Highlighting is the process of lightening isolated strands of hair, often used for a cosmetic change such as covering gray hair or adopting a new color. Permanent and semi-permanent colorings provide options for long-term and short-term color changes, respectively.
Step-by-step explanation:
The coloring technique that lightens isolated strands by weaving or slicing is known as highlighting. This method is part of hair coloring practices used to achieve a variety of aesthetic effects, such as covering gray hair, changing to a more fashionable color, or restoring the original hair color after discoloration from various factors like hairdressing processes or sun bleaching. Highlights can be created using various techniques, including foiling, where strands of hair are separated and treated with a lightening agent, or balayage, where dye is painted on to create a more natural-looking effect.
Permanent hair coloring includes an oxidant and other components that cause a chemical reaction, changing the hair color for a longer period. However, for those looking to avoid a permanent change, semi-permanent color washes out after four to six weeks and offers a subtler coloring option that may create less noticeable root growth and more natural variations in hair color.