The ASTM D 2805-11 (2023) standard provides an accurate instrumental method for determining the hiding power of coatings without reference to Miscellaneous Coatings. This method is suitable for scenarios that require maximum accuracy and minimum subjectivity, such as testing specification coatings or evaluating pigment covering efficiency. Compared to visual test method D344, this standard provides absolutely physical results, avoids subjective interference, and ensures accurate measurement of Coating hiding power. Suitable for air-dried Coatings and appropriately modified baking finishes.