ASTM D1209-05 (2019) "Method for the Determination of Chroma in Colorless Transparent Liquids (Platinum-Cobalt Scale) " aims to measure the Color of solvents, which is essential for evaluating their purity and suitability. This standard uses the Platinum-Cobalt Color scale, which is suitable for a variety of industrial liquids, such as paints, varnishes, and varnish solvents. The preparation of Platinum-Cobalt Color standards follows specific concentration and Optical inspection characteristics that allow for comparability and accuracy of measurement results. The method determines the Color level of a liquid by visually evaluating its ability to absorb light, ensuring that the material used meets the expected quality standards. In addition, this standard also provides the specific operational steps and safety considerations required to implement the test method to ensure the safety of the operator and the safety of the test environment.