Results of Research Activities 17 No.143 2011-7 Fe OH 3 2 1mg/ 5mg/ 1 2 1 2 1 2 3 2 m 50 m 4 How to Distinguish Between Oil Films and Bacterial Films Before Determining that a Film is an Oil Film 1 2 3 1 2 3 G T (Chemistry Team, Nuclear Power, Materials and Chemistry Group, Electric Power Research and Development Center) A method to discriminate a bacterial film, which is often mistaken as an oil