PURPOSE:To make it possible to provide a duplicate picture with the same tone feeling and depth as those of an original picture, by performing offset printing through using three primary color oil-based printing inks in each of which a particulate mineral coloring agent having a color similar to the color of the primary color ink is previously mixed in a specified ratio to the ink. CONSTITUTION:Into each of three primary color oil-based printing inks, a particulate mineral coloring agent having a color similar to the color of the primary color ink is mixed in an amount of 10-150g per 1kg of the ink, and offset printing is conducted by an ordinary method using the three primary color oil-based inks. If the amount of the coloring agent is less than 10g, the intended effect is not displayed, whereas if the amount is more than 150g, it is difficult to conduct printing, and the tone feeling and three-dimensional feeling of the duplicate obtained are different from those of the original. Silk screen printing is applied to parts to be more emphasized, whereby the three-dimensional feeling is further enhanced. In that case, the particulate mineral coloring agent is used in an amount of 200-400g per 1kg of the printing ink.
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