Which hairstyling development in the 1970s utilized aluminum foil?

In the 1970s, frosting and highlighting became prominent techniques in hairstyling, and the use of aluminum foil was pivotal in their application. These methods allowed for selective coloring of the hair; foil was used to separate sections of hair that were to be lightened or colored, giving a more defined and controlled look to the highlights.

By wrapping the hair in aluminum foil, stylists could apply bleach or hair color to specific strands while preventing the mixture from touching the rest of the hair. This not only allowed for a more dramatic effect but also made it easier to control the processing time, providing a more personalized result for clients. The technique became particularly popular as it offered a way to achieve a sun-kissed look, which was highly fashionable at the time.

The other options are related to different hairstyling practices that did not specifically involve the use of aluminum foil or were not as characteristic of the styling trends during the 1970s. Hair curling is a more traditional technique not dependent on foil, Mohawk styling does not utilize foil as it typically involves shaving or cutting the hair into a specific shape, and raw cutting technique refers to a cutting method rather than a coloring technique.