In theory, red, yellow and blue can be used to match most colors, but in fact, the colors of various colorants are not simple colors, but are between the simple colors of adjacent colors. For example, red toner has yellow light red and blue light red, blue toner has red light blue and green light blue, and yellow toner has green light yellow and red light yellow.

In the process of color matching, we should pay attention to the complementarity of color and light. For example, when brightening green, we can use phthalocyanine green directly. For example, to adjust dark green, we should choose green, blue, green and yellow color matching, rather than the complementary colors of red, blue, green and yellow color matching.

Poor mixing of plastic masterbatch and masterbatch will also make the product color changeable. After the masterbatch and masterbatch are mechanically mixed evenly, when they are sent to the hopper by downward suction, the masterbatch is separated from the masterbatch due to electrostatic action, which is easy to be adsorbed on the wall of the hopper, which will inevitably lead to the change of masterbatch dosage during the injection cycle, resulting in color difference.

In this case, the raw materials can be sucked into the hopper and then stirred manually. For adding toner to produce color products, the most effective method is to use hot air dryer instead of water absorber to prevent color difference caused by separation of toner and masterbatch caused by manual feeding.