PURPOSE: To obtain a rush having a clear color at low cost, not causing change of color by impregnating dried reaped rush with a pigment resin solution prepared by blending a solution of the pigment in a solvent with a urethane resin and a water resistance enforcing agent.
CONSTITUTION: Reaped rush, without being subjected to mud dyeing, is dried and impregnated with a solution of pigment resin prepared by dissolving the pigment in an acrylic solvent or vinyl acetate-based solvent, and adding a urethane resin and a water resistance enforcing agent (e.g. diamine-based compound) to the solution to give a rush having a clear color and not causing change of color. By the same way as the above-mentioned method, TATAMI facing (the surface mat of TATAMI in Japanese life) is dyed or sprayed to give clear TATAMI facing not causing dust pollution (since mud drying is not carried out). Old TATAMI can inexpensively be regenerated by the similar dyeing method.