Non-fluorescent forgery-proof safety paper and document obtained

Details Non-fluorescent forgery-proof safety paper and document obtained Non-fluorescent forgery-proof safety paper and document obtained

1989-12-06

1992-10-20

Chin, Peter

Paper making and fiber liberation

Processes and products

Safety, identification and fraud preventing paper

162158, 1621812, 1621813, 427 7, 428916, D21H 2140

Patent

active

051567172

ABSTRACT:
This invention relates to paper-making and in particular to non-fluorescent forgery-proof safety paper which is characterized in that it comprises, on its surface and/or in its mass, a salt of cobalt(II) or (III), at least partially soluble in aqueous phase.

REFERENCES:
patent: 670511 (1901-03-01), Friese-Greene et al.
patent: 673400 (1901-05-01), Kretschmann
patent: 1804978 (1931-05-01), Genoese
patent: 2005105 (1935-06-01), Neff
patent: 2075538 (1937-05-01), Neff

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