To provide a method for producing a plastic substrate, which has good printing suitability, can freely form a steam release opening by printing, can produce a coated product having high adhesion to the plastic substrate and good blocking resistance, does not generate a spark even when irradiated with a microwave, Provided is a photogravure ink composition that does not need to separately form an automatic steam feeding mechanism. A gravure ink composition comprising: A vapor-deposited aluminum pigment (a); an organic solvent (B); and a fatty acid (C), wherein the vapor-deposited aluminum pigment (a) has an aspect ratio of 100:3000. Figure 1

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