1. Color detection: the same raw materials as the carrier are added in proportion (1% or 2%), and 2.5mm thick sheets are obtained by injection molding at a temperature of 170 °C-190 °C (depending on the different raw materials), and the color is compared with the sample, and the light color can be tested by the colorimeter during the comparison, and the dark color can be compared and debugged according to experience under good light conditions.
2. The dispersion is pressed into a film in the same proportion and temperature, and the number of pigment particles is observed.
