Ink composition and marking pen

Abstract

To provide an ink composition which is used in a marking pen having both excellent writing and erasing properties and capable of writing on a surface wetted with water.SOLUTION: An ink composition which is used in a marking pen capable of writing on a surface wetted with water contains, (A) a first solvent consisting of a hydrocarbon solvent, and (B) a second solvent having an SP value of 10.0 or less and miscible with the first solvent. When a mixed solvent in which the (A) and the (B) are mixed is assumed, the maximum amount M of the second solvent contained in 100 g of the mixed solvent that dissolves in 100 g of water is in the range of 1.8 g to 8.0 g. The ink composition further contains (C) a colorant consisting of a pigment or an oil-based dye soluble in the mixed solvent; and (D) a resin soluble in the mixed solvent and having an acid value of 100 or more.SELECTED DRAWING: None