EP 0174885 B1 19880921 - SECURITY PAPER AND DOCUMENT AGAINST FORGERY BY A CHEMICAL AGENT
Title (en)
SECURITY PAPER AND DOCUMENT AGAINST FORGERY BY A CHEMICAL AGENT
Publication
Application
Priority
- FR 8412704 A 19840810
- FR 8505574 A 19850412
Abstract (en)
[origin: US4618402A] 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.
IPC 1-7
IPC 8 full level
B42D 15/00 (2006.01); B44F 1/12 (2006.01); D21H 21/46 (2006.01)
CPC (source: EP US)
B42D 25/29 (2014.10 - EP US); D21H 21/46 (2013.01 - EP US); Y10S 428/915 (2013.01 - EP US); Y10S 428/916 (2013.01 - EP US); Y10T 428/24835 (2015.01 - EP US)
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 0174885 A1 19860319; EP 0174885 B1 19880921; AU 4584585 A 19860213; AU 567480 B2 19871119; CA 1243557 A 19881025; DE 3565138 D1 19881027; US 4618402 A 19861021
DOCDB simple family (application)
EP 85401558 A 19850731; AU 4584585 A 19850805; CA 487382 A 19850724; DE 3565138 T 19850731; US 75836185 A 19850724