WRITING IMPLEMENT AND WRITING IMPLEMENT SET

摘要

Provided are a writing implement lower in cost than conventional writing implements using ink whose color changes by frictional heat, slim and not voluminous because of it being a type receiving ink directly in a barrel, and having excellent portability, and a writing implement set. The ink (2) losing, developing, or changing its color when heated and an ink follow-up body (5) moving forward as the ink is consumed are directly contained in the barrel (2). The writing tip (3) is fixed to the forward end of the barrel directly or via a relay member. The writing implement (1) has an elastic frictional body (6) provided at the rear end of the barrel. The writing implement set is composed of writing implements of the invention and the writing implements have different colors.