The platinum-cobalt scale is a commonly used standard test method for the color of transparent liquids, which is used to qualitatively and quantitatively assess the color of liquids. The following are the basic principles and operation steps of the platinum-cobalt scale:
Principle:
The platinum-cobalt scale is a group of liquid color standard solutions composed of platinum and cobalt. The platinum-cobalt scale is formulated through the concentration layer to obtain different color levels, and gradually transitions from colorless to different color depths. The color level of the liquid can be determined according to the color comparison between the liquid and the platinum-cobalt scale.
Operation steps:
Prepare a platinum-cobalt scale: Prepare a platinum-cobalt scale solution of the corresponding concentration according to the desired color level.
Calibration: Place the platinum-cobalt scale under a standard light source and calibrate the conditions of visual perception to ensure accurate color comparisons.
Test sample: Compare the transparent liquid sample to be tested with the platinum-cobalt scale against the same background. Take care to ensure that the temperature and lighting conditions of the sample and scale are similar.
Comparison and evaluation: Compare the sample to be tested with the platinum-cobalt scale step by step, find the color level that matches the scale, and evaluate the color of the liquid.
The platinum-cobalt scale is a subjective evaluation method, and the results may vary depending on the subjective factors of the observer. Therefore, when conducting color evaluation, it is best to have multiple observers independently evaluate and average to improve accuracy. In addition, the platinum-cobalt scale can only provide a relative comparison of the color of liquids, not accurate color values. If accurate color measurement and comparison is required, professional equipment such as spectroscopic analysis instruments or Colorimeters may be required.
