An ink composition according to the present invention includes (1) a leafing type fine metal powder having a median particle size of from about 4 .mu.m to about 11 .mu.m, the powder being present in an amount, relative to the total amount of the ink composition, within the range of from about 10% to about 38% by weight, the powder being selected from a copper alloy, aluminum, copper, or zinc whose surface is treated by a saturated fatty acid having 16 to 22 carbon atoms, or salts thereof. The ink composition further includes (2) a petroleum resin having iodine value of not more than 30 (g/100 g), whereby the resin is present in an amount, relative to the total amount of the ink composition, within the range of from about 10% to about 30% by weight; (3) at least two kinds of hydrocarbon solvents, whereby the solvents are present in an amount, relative to the total amount of the ink composition, within the range of from about 32% to about 80% by weight.