| http://www.w3.org/ns/prov#value | - A method according to claim 7 wherein the article is a paper document that has been marked with the mixture of fluorescent complexes by the steps of: at a printer, placing a varnish containing the fluorescent complexes into a trough; printing a propylene film containing the fluorescent complexes to form a printed film; cutting the printed film into strips constituting security threads; and, incorp
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