The color of pigment carbon black has a certain relationship with the size of the particles, the surface structure of the particles and the amount of components of the adsorbed volatile substances. The blackness and brightness of carbon black are often based on its high dispersion performance, otherwise, the blackness and brightness of carbon black with fine particle size cannot be displayed.
The color of carbon black in the dry state is inconsistent with the color of carbon black dispersed in the paint, because the blackness of carbon black has a great relationship with its dispersibility. To compare the blackness, disperse carbon black in the paint base to make a color paste, and then make a color paint, and then make a coating film test piece for comparison.
Compared with the carbon black used, the color of carbon black is also one of the important indicators. Usually, the hue of carbon black is formed by three primary colors, namely red, yellow and blue. Lamp black and furnace carbon black have a very pronounced blue hue. When mixing gray paint, furnace black is often used.