GB/T 46441-2025 "Imaging Materials – Colour Reflection Photographs – Test Method for Ozone Fading Stability" is applicable to the ozone fading stability testing of colour reflection photographs and is equivalent to the relevant international standard. It specifies the use of accelerated aging tests to simulate the effects of ozone exposure, detailing core parameters such as test equipment requirements, ozone concentration control, and temperature and humidity conditions. The standard covers sample preparation, storage and measurement conditions, testing procedures, and result evaluation, requiring the recording of degradation phenomena such as colour changes in photographs. An appendix provides references for reciprocity conditions. It offers a unified method for assessing the durability of imaging materials, supporting product storage life prediction and quality control.