Bleeding ink for printing security documents

A bleeding or fugitive printing ink is disclosed and claimed which can be printed by the method of dry or wet offset or letterpress. This ink allows, when printed on securitydocuments and dried, to prevent attempts of forgery or counterfeit in that the ink contains at least one dyestuff which is sensitive to organic solvents and other chemicalreagents. The ink, when printed, forms a solid, polymerized or cross-linked binder matrix on the surface of the document when the printings are submitted to energy radiation, orby an oxypolymerization reaction. This matrix is formed near immediately, in the case of oxypolymerization within 24 hours, in contrast to conventional bleeding printing inkswhose matrixes do not really dry and remain liquid in the interstices of the substrate.

Bob writes:

To read the complete patent, see:
United States Patent 6,306,929 Bleeding ink for printing security documents(http://www.freepatentsonline.com/6306929.pdf )

For more on security inks, see:
Security Inks What types of security inks are there?(http://www.securitylitho.com/Pages/Glossary/Security%20Inks.html)