Preservation of postage stamps, etc.

摘要

An auxiliary paper with the characteristics of filter paper is impregnated with an active germicide which has a vapour pressure sufficiently high for auto-transmission, a pH of 7-9 and is totally free from any organic adhesive contg. coagulable substances. The paper is placed in intimate contact with the stamp or similar object at normal ambient temp. so that the active substances evaporate slowly, penetrating and filling the pores of the paper, as well as fixing themselves irreversibly in the adhesive by coagulation.