What technique is used to loosen or relax tightly curled hair by about 50%?

Curl diffusion, also known as a chemical blowout, is the technique specifically designed to loosen or relax tightly curled hair by approximately 50%. This process involves using a combination of heat and a chemical solution that aids in breaking down the structure of the hair's curl pattern, allowing it to fall more loosely and appear less frizzy.

The method is favored for those seeking a less permanent solution compared to standard hair relaxing treatments, yet still provides significant changes to the curl's tightness. It is especially beneficial for people with curly hair who want more manageable styles without completely straightening their hair. This approach helps in enhancing the hair's natural texture while reducing bulkiness and frizz, making it easier to style.

Other methods mentioned, like hair smoothing and relaxing, refer to techniques that may have different purposes or effects. Hair smoothing generally aims for a sleeker look without significant alteration of curl pattern, while relaxing is a more permanent method that can straighten hair completely. Curl activating is focused on enhancing and defining curls rather than loosening them.