Color and Printability of Paper

With respect to the printability of paper, several problems of color were investigated.Summary was as follows.(1) Max., min., and average qualities of each grade of printing Papers in Japan.(2) Inter relation of each other properties of paper testing figures of the middle class printing Paper.(3) Spectral reflect curve of the typical papers and pulps.(4) Effect of dyes on the paper color.(5) Effect of the kinds of color inks and paper qualities on the printing coloring effect.(6) Relation between paper testing values and theprinting coloring effect.Coloring effect was measured by means of comparing the spectral reHect curve of test sample with that of standard sheet printed under the standard condition.Calculation of the relation between A and B was done as follows.pA→B=SA (B) -a-1/b-1SC (B) /ST (B) -a (r-1) /b (r-1) SM (B)