Abstract: There is provided a print ink system used for printing “a print IT shopping-linked printed matter” used in a commodity sales method in which a commodity can be ordered by converting a commodity information image in an imaged partition into an electric signal and transmitting it via a predetermined network, and by replying the order of the commodity, the order for the commodity is received and the commodity is sent, and furthermore, charging for the commodity cost is performed. The print ink system uses a combination of a print ink (a) for printing “a visible image of a commodity” (A) and a print ink (b) for printing “a commodity information code” (B).