To provide a mildewproofing crayon readily wiping off a coated film even when the coated film sticks to a tile part (i.e. having erasability) without readily wiping off the coated film in joints (i.e. non-erasable) and clearly carrying out marking because no fiber bundle chip, fiber or hair of a brush is left on the joints and performing the marking even when the joints are wetted with water, etc., without causing separation or light and shade of an ink with time.

The mildewproofing crayon can be wiped off on the tile, has adhesiveness on the joints and is characterized as comprising at least a solvent, a resin soluble in the solvent, an erasability imparting agent, a mildewproofing agent and a gelling agent.