Platinum-cobalt scale is a common standard test method for the color of transparent liquid, which is used for qualitative and quantitative evaluation of liquid color. The following is the basic principle and operation procedure of the platinum-cobalt scale:

Principle:

The platinum-cobalt scale is a set of liquid color standard solutions consisting of platinum and cobalt. Platinum-cobalt scales are adjusted by concentration gradient to obtain different color levels, from colorless gradually to different color depths. The color level of the liquid can be determined by comparing the color of the liquid with the platinum-cobalt scale.

Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)

Operation steps:

Prepare a platinum-cobalt scale: Prepare a platinum-cobalt scale solution of the appropriate concentration according to the desired color level.

Calibration: A platinum-cobalt scale is placed under a standard light source and the condition of visual perception is calibrated to ensure accurate color comparison.

Test sample: The clear liquid sample to be tested is compared with the platinum-cobalt scale against the same background. Take care to ensure that the temperature and lighting conditions of the sample and ruler are similar.

Comparison and evaluation: The sample to be tested is compared with the platinum-cobalt scale step by step to find the color level matching the scale and evaluate the color of the liquid.

We reminds you that the platinum-cobalt scale is a subjective assessment method, and the results may vary depending on the subjective factors of the observer. Therefore, in color evaluation, it is better to be evaluated independently by multiple observers and take average values to improve accuracy. In addition, the platinum-cobalt scale can only provide a relative comparison of liquid colors and cannot provide accurate color values. If accurate color measurements and comparisons are required, professional equipment such as spectral analysis instruments or colorimeters may be required.