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At present, various mineral fillers such as kaolin, wollastonite, talc, mica, heavy calcium carbonate, and light calcium carbonate are widely used in coatings, plastics, paper, ink, enamel, and daily chemical industries. The filling effect of mineral fillers is related to its chemical composition, particle size, surface area, electrical properties, color and other performance indicators. Among them, whiteness is usually one of the most important factors affecting the performance, price and economic benefits of natural mineral filler products. Most inorganic mineral fillers, such as kaolin, talc, pyrophyllite, calcium carbonate, wollastonite, etc., should exhibit the white color of the mineral itself when its impurity content is very low. Generally, the main cause of the decrease in mineral whiteness is impurities.

According to the state and nature of impurity production, it can be roughly divided into three categories:

The first type is organic matter deposited with mineral rock, called organic carbon, which dyes mineral rock gray-black. In most cases, carbon is mixed in the form of mechanical inclusions, but during the diagenesis process, some of the carbon may be encased in the crystal lattice, which poses certain difficulties in removing carbon.

The second type of dyeing impurities are pigment elements such as Fe, Ti, V, Cr, Cu, etc. In general, Fe and Ti are the main dyeing elements.

The third type of dyeing impurities are dark minerals such as biotite and chlorite. Dark minerals are often secondary to mineral rock coloring. Therefore, the main factors affecting the whiteness of mineral rocks are organic matter, iron and titanium.