We have made some experiments on whiteness, smoothness as well as opacity. Whiteness is remarkably less in Japanese paper than in foreign-style paper. Japanese paper, when utilized to coloured paper, demands particular deliberation upon its whiteness. Smoothness is important in case of printing: but the weak-point is that smoothness differs between one surface and the reverse. Opacity relates to closeness ; the denser the closeness is, the bigger the opacity becomes. Japanese paper, on the whole has a small opacity.