The fineness of the pigment has a great influence on the colored product. Generally, the finer the fineness of the pigment, the higher the coloring power.
However, the fineness of the pigment is too fine to increase the surface area, and the pigment particles are attracted to each other to form large particles due to the influence of van der Waals force. Moreover, the fineness is too fine to improve the transparency of the pigment and further affect the various fastnesses. Therefore, the fineness should be controlled. According to the principle of optics, the size of the pigment particles reaches half of the visible light, that is, 0.2μ-0.4μ. .
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