To demonstrate the effects of Bincho charcoal (high quality hard charcoal in gapan) and copper sulfate easily and sufficiently.

White carbon particles are used as a nonwoven cloth core material and compression processed into the sheet shape through a special binder. Namely, a sheet-shaped synthetic resin nonwoven cloth 3 of 100 cm width is used as a core material, and Bincho charcoal 2 in the form of fine particles of several tens μm is pressure bonded in the uniform thickness on the core material by using a compression processing machine and a special binder to manufacture a Bincho charcoal sheet material 1 of 0.5 mm thickness.