The present invention provides a preparation that has the same effects as those under light irradiation for a long period of time without light irradiation, and can exert these effects in a short time. In one aspect of the present invention, a preparation that does not require light irradiation and still has the same effect as that under light irradiation is characterized in that it includes composite particles in which silver particles and titanium oxide or tungsten oxide particles are physically combined, and At least one material selected from: (1) at least one metal or metal oxide particle other than silver selected from copper, copper oxide, nickel, zinc, tungsten, tungsten oxide, molybdenum, and molybdenum oxide； Salt, (3) silver ion supported zeolite.本發明提供一種無需光照射仍長期、持續地具有與於光照射下所具有之效果相同之效果，並且可於短時間內發揮出該等效果之製劑。本發明之一態樣之無需光照射仍具有與於光照射下所具有之效果相同之效果的製劑之特徵在於包含：銀粒子與氧化鈦或氧化鎢粒子物理地結合而成之複合粒子、及選自如下中之至少一種材料：(1)選自銅、氧化銅、鎳、鋅、鎢、氧化鎢、鉬、氧化鉬中之至少一種銀以外之金屬或金屬氧化物粒子、(2)銀鹽、(3)銀離子擔載沸石。
