Which terms describe pile reversal in cut pile yarns?

The correct answer highlights terms that are particularly relevant to the phenomenon of pile reversal in cut pile yarns. Pile reversal occurs when the directional flow of the yarn causes noticeable differences in color and texture, resulting in visual effects on the carpet.

"Pooling" refers to the accumulation of fibers that can affect the appearance of the carpet, often leading to areas that appear darker or lighter due to how light interacts with the yarns. "Shading" is directly associated with this effect as well, capturing the changes in color that often occur when the pile has been altered in direction. The term "water marking" is used to describe a specific type of shading effect that resembles the appearance of water spots, emphasizing the changes seen in areas where the pile has reversed direction. This combination effectively describes the visual characteristics associated with pile reversal in cut pile yarns.

In contrast, other options include terms that do not accurately relate to the visual phenomena caused by pile reversal. For instance, "fuzzing" describes the fraying or roughening of carpet fibers, which is not directly tied to the directional changes seen in pile reversal. Similarly, "matting" and "fraying" relate to different conditions or damage in the carpet, while "fraying" indicates