Security paper

Details Security paper Security paper

1977-10-25

1979-01-23

Ansher, Harold

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Of carbohydrate

8 1B, 8 542, 106148, 162140, 427 7, 427157, 427158, 428411, 428913, 428916, D21H 510, B41M 314, B44F 112

Patent

active

041362292

ABSTRACT:
Security paper which immediately reveals an attempt to alter handwriting thereon by the use of an alkaline ink remover and which is characterized by the incorporation therein of a pyrenesulphonic acid or a metal salt thereof, particularly an alkali metal or alkaline earth metal salt.
Security paper incorporating such an acid or salt exhibits a fluorescent coloration when contacted with an alkaline ink remover.

REFERENCES:
patent: 2445586 (1948-07-01), Simons
patent: 3088949 (1963-05-01), Moser et al.
patent: 3767516 (1973-10-01), Brady
patent: 3804774 (1974-04-01), Betts et al.
patent: 3886083 (1975-05-01), Laxer
patent: 3928226 (1975-12-01), McDonough et al.
patent: 4037007 (1977-07-01), Wood

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