What is lightfastness in textiles primarily concerned with?

Lightfastness in textiles refers specifically to the fabric's ability to resist fading when exposed to light, particularly sunlight. This property is crucial for maintaining the aesthetic quality of textiles used in interiors, as prolonged light exposure can lead to color changes or fading over time. Fabrics with high lightfastness will retain their original color and vibrancy longer, making them more suitable for applications in spaces where they will be illuminated, such as window treatments or upholstery in well-lit areas.

Understanding lightfastness is essential for designers and manufacturers as it impacts the longevity and visual appeal of the fabric under typical usage conditions. Fabrics with poor lightfastness may require more frequent replacement or special treatment to mitigate fading, making them less practical for certain applications.

The other options, while related to textile properties, do not pertain specifically to lightfastness. Therefore, focusing on the aspect of fading due to light exposure provides a clear understanding of why this characteristic is critical in textile selection for interior applications.