Means, paper and document security against falsification by chemical agent and the counterfeiting.

摘要

This means of security against the chemical falsification of documents established on paper or on layered synthetic supports comprises at least one salt of cobalt of oxidation stage 2, giving an orange-coloured reaction in the presence of a sodium bisulphite solution. Advantageously, the cobalt salt is chosen from the group including cobalt sulphate, cobalt chloride, cobalt acetate, cobalt nitrate, cobalt thiocyanate and cobalt acetylacetonate.