Evaluation Protocol
Standardized testing procedures define empirical methods for determining the color stability of textiles against chemical, physical and atmospheric degradation. ISO 105 fastness encompasses a series of international laboratory protocols assessing color change in dyed or printed substrates and color transfer to adjacent uncolored materials. The scope of this standard governs color permanence under simulated end-use and processing exposures, ending where destructive physical fiber degradation and tensile mechanical tearing occur independently of dye retention.
Stress Exposure
Laboratory technicians subject prepared fabric specimens to calibrated chemical, thermal and mechanical actions in specialized test chambers. Sub-methods test resistance to laundering, domestic washing, light exposure, rubbing, perspiration, water spotting and dry cleaning. Multifiber adjacent fabrics containing wool, acrylic, polyester, polyamide, cotton and acetate are sewn against test swatches to capture staining tendencies.
ISO 105 fastness testing applies controlled chemical solutions at precise temperatures to simulate user wear and wet industrial processing. Standardized grey scales for color change and staining convert visual or instrumental reflectance readings into numerical ratings ranging from grade one to grade five. Grade five represents no perceptible change or transfer, while grade one indicates severe degradation.
Spectrophotometers calculate color difference values according to international colorimetric equations to eliminate human observer bias.
Color Change
Fabric specifications establish mandatory minimum fastness grades according to final garment application and market tier. Outerwear fabrics require elevated light fastness ratings under xenon arc exposure, whereas intimate apparel emphasizes perspiration and wet wash resistance. ISO 105 fastness determinations dictate dye class selection during wet processing, forcing dyehouses to choose reactive, vat or disperse formulations capable of meeting target thresholds.
Mills adjust scouring and washing-off procedures to remove unfixed surface dyes before submitting production swatches.
Compliance Matrix
Quality verification marks lot conformity against retail and brand performance manuals. Batches failing to achieve designated ISO 105 fastness ratings face rejection before cutting or shipment. Test reports from accredited independent laboratories serve as commercial proof of performance during final contract settlement.
