Color Fastness Test

Color Fastness Test is a testing item in textile foreign trade that evaluates the ability of dyes to retain color on fabrics. It mainly assesses indicators such as washing fastness, rubbing fastness, light fastness, and perspiration fastness. Usage scenarios include: buyers requiring test reports as a prerequisite for placing orders, letters of credit stipulating compliance with specific color fastness grades, and exports to markets such as Europe, America, and Japan needing to meet regulations (e.g., REACH, CPSIA). Precautions: different testing standards (ISO, AATCC, GB) may yield different results, so the standard and grade (e.g., grade 4 or above) must be clearly specified in the contract; test samples must be consistent with bulk goods, otherwise the report is invalid; testing cycle and costs should be confirmed in advance. Difference from other terms: Color Fastness Test focuses on color durability, while 'Color Difference Test' focuses on color consistency between batches; 'Formaldehyde Test' focuses on chemical safety. Foreign trade practitioners should specify the testing standard, grade, and responsible party in the PI or contract to avoid returns or claims due to substandard color fastness.