Safety means, paper and document against falsification by chemic

Details Safety means, paper and document against falsification by chemic Safety means, paper and document against falsification by chemic

1985-07-24

1986-10-21

Chin, Peter

Paper making and fiber liberation

Processes and products

Safety, identification and fraud preventing paper

162158, 1621681, 1621812, 428199, 428915, 428916, D21H 510

Patent

active

046184023

ABSTRACT:
The paper according to the invention contains a non-fluorescent means against chemical falsification, reacting to the oxidizing agent/reducing agent couple. The paper according to the invention contains iron(III) and a product giving a complex colored with iron(II). Any attempt to falsify by chemical means provokes the reduction of the iron(III) into iron(II) immediately followed by the formation of the colored complex. According to the invention, the complexing agent is preferably 2,2-bipyridyl. Another complexing agent is orthophenantroline.

REFERENCES:
patent: 2186810 (1940-07-01), Simons
patent: 2378585 (1945-06-01), Schroth
patent: 2379443 (1945-07-01), Kantrowitz

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