Characterization of the nature of the carbon black index. Will a certain amount of carbon black and white pigment (usually zinc oxide or titanium dioxide) mix in oil exhibition color agent, grey ink paste made and then determined the ink to visible light scattering of pulp ability. High strength carbon black color, light absorption coefficient high reflectivity and low. Shading strength mainly reflect the average aggregate volume and size distribution.

The vast majority of black carbon content is higher than 97%, only a few pigment with carbon black carbon content below 90%. Carbon black on the surface in addition to chemical combination with oxygen, besides water, solvent spare things, sulfur, hydrogen and inorganic salt. Hygroscopic with surface activity, surface area and inorganic salt content increases. Carbon black solvent that is not out from the pyrolysis of hydrocarbons. The carbon black sulphur content in the amount of sulfur depends on raw materials. The inorganic salts mainly comes from the process urgent cold water and granulation water.