Fabric colorfastness is a crucial indicator of the color stability of textiles during use and washing. Colorfastness testing is typically conducted according to international and national standards, such as ISO, AATCC (American Association of Textile Chemists and Dyers), and GB (Chinese National Standard). The main testing content includes the fabric's resistance to various environmental conditions such as washing, rubbing, perspiration, light exposure, and dry cleaning, ensuring that the fabric does not fade, change color, or migrate during daily use.
Common testing items include wash fastness, wet and dry rubbing fastness, perspiration fastness, light fastness, and dry cleaning fastness. Wash fastness tests the color change of the fabric after multiple washes; wet and dry rubbing fastness measures whether dye transfer occurs when the fabric is rubbed; perspiration fastness tests the fabric's stability under acidic or alkaline perspiration conditions; and light fastness assesses the fabric's fading under sunlight or artificial light. These indicators are combined with a grading system (usually 1-5 points, with 5 being the best) to determine fabric quality.
Fabric colorfastness testing also emphasizes functionality and special applications. Outdoor clothing needs to be resistant to light, water, and perspiration; industrial uniforms need to be colorfast and easy to clean; children's and home textile fabrics need to meet environmental and safety standards to prevent the migration of harmful dyes. Rigorous colorfastness testing ensures the color stability and safety of fabrics throughout production, sales, and use, improving the durability and aesthetics of finished products.