Authenticatable security paper

Details Authenticatable security paper Authenticatable security paper

1990-03-14

1993-02-23

Sluby, P. C.

Stock material or miscellaneous articles

Article having latent image or transformation

4285377, 428913, 428915, 428916, 162140, 283 95, 503210, 434328, B44F 110, D21H 2146

Patent

active

051888718

ABSTRACT:
A security paper authenticating system comprises, in combination, a security paper carrying both starch and an iodate salt, typically potassium iodate, and an authenticating composition comprising an acidic solution of an iodide salt, typically potassium iodide, the system being such that on applying the authenticating composition to authentic security paper, as by a pen, brush or stamp pad, iodine is generated and a characteristic starch-iodine coloration is produced. The authenticating composition is preferably aqueous or part-aqueous, and is preferably made acidic by means of a weak organic acid such as tartaric acid. The authenticating composition preferably also contains an antioxidant such as ascorbic acid. The invention extends to the paper and the authenticating composition individually.

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Francis L. Simons, "Safety Papers-A Review of Theory and Practice", TAPPI, Oct. 1951.

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