Patent Number: 6,966,998

Title: Security printing

Abstract: A method of providing covert security features for documents such as vouchers, packaged goods and banknotes in which the document is provided with a dopant. The dopant consisting of a material which can be identified by examination of its response to visible wavelength photon radiation and which can be applied directly on or into the document or can be fused into glass matrices before application.

Inventors: Spowart; Alexander Rollo (Argyll, PA23 8PW, GB)

Assignee:

International Classification: B41M 3/14 (20060101); F21V 009/00 (); G06K 009/74 (); C03C 008/00 ()

Expiration Date: 1/22/02018