Which of the following wraps uses only one end paper folded in half?

The bookend wrap technique is characterized by the use of a single end paper that is folded in half to create a protective barrier for the hair strand being processed. This method allows for better control over the curl formation and minimizes the risk of hair breakage at the ends. By folding the end paper, it effectively supports the hair during the perming process, ensuring that the ends are well-covered and minimizing frizz and damage.

In contrast, the other wrapping techniques involve different methods of using end papers or multiple papers. For instance, the basic perm wrap typically employs two end papers on each section of hair to provide maximum protection and curl definition. The bricklay perm wrap utilizes a staggered pattern that allows for a more creative and natural-looking curl, utilizing multiple end papers for better distribution. Bender rod wrapping incorporates rods that allow for various shapes and sizes of curls, often involving more than just a single piece of end paper.

Understanding these specific techniques reinforces the importance of the application methods used in chemical texturizing, as each has its distinct purpose and outcome in the overall process.