We examined the porous nature of the silica coating color for papers using N₂ adsorption isotherms. Silica was used as the coating color pigment. It was suspended in a 10 wt% aqueous solution of polyvinylalcohol. The silica contents were 10 and 20 wt%. Air-dried pieces of the coated layer were used for the adsorption experiments. The porosity of the coating colors was determined by the BET plot, the SPE method, and the DR plot. These results indicate that pristine silica does not have very small intrinsic intraparticle pores, but the interparticle pores determine the external surface area, which indicates that the entrance of the pores should be covered with the binder polymer and the micropores behave as latent pores.