What technique requires the hair strand to be sandwiched between two end papers?

The technique that involves sandwiching the hair strand between two end papers is known as a double flat wrap. This method is utilized in chemical texturizing to ensure that the hair is securely held in place while preventing damage and allowing for even product distribution.

In a double flat wrap, the end papers, which are thin sheets of absorbent material, serve to protect the ends of the hair from being exposed directly to the chemicals. By placing the hair between two sheets, stylist can better control the section and enhance the curl or wave pattern that will be achieved during the process. The use of two end papers allows for more flexibility and helps to maintain consistent tension, which is crucial for achieving the desired texture outcome.

This technique contrasts with other methods like the single flat wrap, where only one end paper is used, and thus may not provide the same level of protection or control. Similarly, the bookend wrap does not involve two end papers being used in parallel but instead uses one paper folded over the ends, which can limit the ability to secure the hair adequately. A directional wrap focuses more on the way the curl is formed and may not require the use of end papers in the same manner as the double flat wrap. Therefore, understanding the mechanics and protective