What does colorfastness refer to in textiles?

Colorfastness in textiles specifically refers to the ability of fabric to retain its color when exposed to various environmental conditions such as washing, sunlight, and wear. This property is crucial in determining the longevity and durability of a textile's appearance.

When a fabric has high colorfastness, it means that the dyes used in the fabric will not wash out, fade, or bleed over time, ensuring that the material maintains its intended look through repeated use and care. This characteristic is especially important for garments and home textiles that are subject to frequent washing and light exposure.

The other options, while related to various attributes of textiles, do not accurately define colorfastness. The strength of fabric fibers against wear pertains more to the durability and tensile strength of the material, rather than how well it maintains its color. The process of dyeing fabric refers to how color is imparted to textiles, which is not the same as their ability to maintain that color. Lastly, the weight of the fabric in grams measures density and does not relate to color retention at all. Thus, the option that accurately captures the essence of colorfastness is indeed the ability of fabric to retain its color under various conditions.