Writing implement

A writing implement in which liquid for ink and colorant are separately stored, comprising:

• a cylindrical shaft member;
• a pen tip member which is fixed to one end of the shaft member and from which colored ink seeps out;
• the liquid for ink which is stored in the shaft member and which comprises a major component of the colored ink seeping out from an end of the pen tip member;
• the colorant to be added to the liquid for ink to be the colored ink, located between the tip member and the liquid for ink;
• and
• a valve member for isolating the colorant from the liquid for ink;
• wherein at least a part of a cylindrical side surface of the shaft member corresponding to a part where the liquid for ink is stored is formed to be transparent;
• wherein the valve member is positioned between the storing part of the liquid for ink and the colorant;
• and
• wherein the storing part of the liquid for ink is provided with a pressure-regulating part for preventing an increase or decrease of a pressure in the storing part.