. . "In the present invention, the pigment, which substantially serves as the source of supporting particles of water-soluble dyes, can be exemplified by inorganic pigments such as calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titania, zinc oxide, zinc carbonate, aluminum silicate, alumina hydrate, magnesium silicate, calcium silicate and silica, and organic pigments such as plastic" . .