Prevention of the growth of bacteria and mold. In order to prevent the growth of bacteria and mold on stored items, it is advisable to add substances that inhibit their growth to the packaging or protective coatings.. For this purpose, e.g.. sodium benzoate for paper, and for coatings and organic materials, the so-called. poisoners, e.g.. copper salts of various organic compounds. It is also necessary to store packages with metal products in the light, dry storage rooms, where the possibility of mold and bacterial growth is low, as a result, the possibility of damage to the protective packaging is minimized. Insects and rodents attack primarily packaging, allowing the penetration of atmospheric factors directly into the metal. Their action on metal is rare and is limited only to the corrosive effect of insect and rodent secretions on packaged, preserved items of metal.