This document, AATCC Test Method 16.1-2012, details the general principles and procedures for determining the colorfastness to light of textile materials when exposed outdoors under glass. The method is applicable to all types of textile materials, as well as the various colorants, finishes, and treatments applied to them. It outlines specific steps for test specimen preparation, general exposure conditions, and comprehensive evaluation of results. Key aspects include simultaneous exposure of test specimens with AATCC Blue Wool Lightfastness Standards to daylight behind window glass, and assessing color change using the AATCC Gray Scale or instrumental color measurement. The standard also covers crucial terminology, safety precautions, limitations, and reporting requirements, ensuring a standardized approach to evaluate the lightfastness and durability of textiles in outdoor environments.

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