Forgery-proof paper

Details Forgery-proof paper Forgery-proof paper

1982-07-22

1984-10-23

Chin, Peter

Paper making and fiber liberation

Processes and products

Safety, identification and fraud preventing paper

162158, 427 7, 428916, D21H 510

Patent

active

044786816

ABSTRACT:
Forgery-proof paper, which exhibits a distinct coloration when treated with an oxidizing agent and, if appropriate, a reducing agent, contains, as the reagent, a compound of the formula ##STR1## wherein A represents N or C,

REFERENCES:
patent: 2061632 (1936-11-01), Lenher
patent: 2075538 (1937-03-01), Neff
patent: 4024125 (1977-05-01), Kunstmann et al.
Translation of German Pat. No. 270,861.
Translation of German patent specification No. DE-PS92011.

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