Pigment tinctorial strength quantitative determination

White pigments and yellow pigments Mix the right pigments and natural cooking oil in the quantities listed in Table 7, and grind them with a pestle on a board. Then, in the continuous grinding process, slowly add the test pigment and natural cooked oil. Paint the mixture of the correct pigment and the tested pigment on the white iron plate for a certain period of time and compare it with the standard coating film. After each comparison, the tested color. The paint is scraped off the board with a scraper and added to the total amount (relevant instrument: Bar Coater). The pigments to be tested must be added continuously until the coating film to be tested reaches the standard shade. According to the difference between the weight of the tested pigment and the container before and after the test (weighing must be accurate to 0.01 grams), the weight of the pigment used to prepare the required shade can be measured. The tinting strength of the paint can be obtained by the following formula:

Black, blue and red pigments The pigments to be tested were ground with a pestle on a board with natural cooking oil in the quantities listed in Table 7. Then, in the case of continuous investigation, slowly add the right pigment, and then paint the test plate and compare it with the standard sample. The right pigments must be added continuously until the tested coating film reaches the standard shade (relevant instrument: Color Chart). According to the weight difference before and after the test, the weight of the penetrating pigment used to obtain the necessary shade can be measured. The tinting strength of the paint can be calculated as follows: