GB/T 17001.4-2025 is the fourth part of the series of national standards for anti-counterfeiting ink, which is formulated for daylight-induced discoloration anti-counterfeiting ink. The standard specifies the classification, technical requirements, test methods, inspection rules, and marking, Encasement, transportation and storage requirements for such inks. It is applicable to anti-counterfeiting ink products that have significantly changed Color under sunlight and returned to their original state after leaving the light. Compared with the 2002 version, the new version has been updated and improved in terms of classification, technical indicators, test methods, etc., aiming to standardize product production and application, ensure the Reliability and Stability of anti-counterfeiting effects, and safeguard the rights and interests of production, use and consumers.