GB/Z 42964 - 2023 focuses on the evaluation of the effectiveness of the deacidification process of paper documents in libraries. It formulates a comprehensive evaluation method, which clearly covers the detection indicators such as alkalinity, strength and Color change of paper acid before and after deacidification. Detailed description of relevant testing equipment and operation procedures to ensure accurate detection. Through this standard, the library can scientifically judge the effect of different deacidification processes, screen out suitable methods to protect paper documents, effectively prolong the life of precious documents, and provide a reliable basis for the long-term preservation of paper documents in libraries.