The present invention includes: a preparation step for preparing a base material a inclusion step (S7) that causes the inclusion in the base material of a composition containing VOSO4, K11H[(VO)3(SbW9O33)2], Na9[SbW9O33], oxacillin, and 5-chloro-2-(2,4-dichlorophenoxy)phenol and a drying step (S8) for drying the base material caused to include the composition.基材を準備する準備工程と、前記基材にVOSO4、K11H[(VO)3(SbW9O33)2]、Na9[SbW9O33]、オキサシリン及び5-クロロ-2-(2,4-ジクロロフェノキシ)フェノールを含む組成物を含有させる含有工程(S7)と、前記組成物を含有させた前記基材を乾燥させる乾燥工程(S8)とを含む。