The ASTM D7305-08a (2020) standard test method is used to determine the reflection density of printed products. Reflection density is an important indicator of the Color intensity and light absorption capacity of printed products, and is widely used in printing quality control and color management. The standard provides precise measurement procedures and equipment requirements to ensure the comparability and conformity of reflection density across different printing types. This test method allows printers to evaluate the color saturation, uniformity, and printing quality of the printed products, ensuring that the printed products are produced in accordance with predetermined Color standards. This method is suitable for various printing materials and printing processes, and has important industrial application value.