. . . . "o preventing the ink solvent from bleeding out of the surrounding of a printed part as a lapse of time. [0045] Examples of a pigment to be used in the undercoat layer include inorganic pigments such as barium sulfate, calcium carbonate, titanium oxide, kaolin and the like. [0046] It is not clear why these pigments prevent an ink solvent of a non-aqueous ink from penetrating through a paper to be p" . .