Patent ID: 8173052

Claim:
A writing implement comprising: an ink composition that turns from a colored state to a colorless state for the writing implement; and a frictional body for erasing a colored writing formed by the ink composition, wherein the ink composition comprises a thermochromic coloring color-memory microcapsule pigment comprising a thermochromic coloring color-memory composition in a colored state, the thermochromic coloring color-memory composition comprises a homogeneous solubilized mixture of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) a reaction medium which controls color reactions of the components (A) and (B), a complete decoloring temperature (T 4 ) of the thermochromic coloring color-memory composition is 50° C. or higher and a coloring starting temperature (T 2 ) of thermochromic coloring color-memory composition is 10° C. or lower regarding the color density-temperature curve, and the thermochromic coloring color-memory composition has color-memory ability at the ordinary temperature range.