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

The technique that is used to loosen or relax tightly curled hair patterns by about 50% is curl diffusion, also known as a chemical blowout. This process involves the application of a chemical product designed to break down the bonds in the hair, which are responsible for the tight curl pattern. By doing so, it achieves a more manageable texture that is softer and less coiled.

Curl diffusion is specifically formulated to reduce curl without straightening the hair completely, making it ideal for clients who desire a more relaxed wave or curl rather than a fully straightened look. This process is popular among individuals looking to ease the styling effort while still maintaining some wave or curl in their hair.

The other options, while related to hair texture, do not specifically address the loosening of tightly curled patterns. Hair rebonding refers to a more permanent straightening method, texturizing relates to cutting techniques that add volume and shape, and conditioning treatments focus on improving hair health rather than altering the curl pattern. Thus, curl diffusion stands out as the appropriate technique for achieving a partial relaxation of curl.