To prevent the refouling of an existing body by forming a surface layer on the cleaned surface of the body with a composite contg. photocatalytic titanium oxide and transition metals and oxidatively decomposing the harmful matter in contact with the titanium oxide by the surface layer as excited by light.
An existing base 24 with a contaminant depositing on the surface 23 is cleaned, and then a composite prepared by incorporating phosphoric acid 22 in a primer contg. silica as a metal oxide 21 is applied on the surface 23 to form a substrate layer 25. The substrate layer 25 is tempered in a drying furnace to form a permanent substrate layer 26, a composite formed by incorporated copper as transition metals 28 in a coating agent contg. photocatalytic titanium oxide 27 and included in the polymer gel of sodium alginate as an org. matter protective substance 29 is applied on the permanent substrate layer 26 to form a surface layer 30, and the harmful matter in contact with the titanium oxide 27 is oxidatively decomposed by the surface layer 30 as excited by light.
SHINOGAYA SATOSHI
IZUMI TAZURU
