Raman markers
AssigneesFabrica Nacional de Moneda y Timbre-Real Casa de la Moneda, Consejo Superior de Investigaciones Cientificas
InventorsAlberto Moure Arroyo, José Francisco Fernández Lozano, Victor Fuertes De La Llave, Esther Enríquez Pérez, Vicente García Juez
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Abstract
The present invention relates to a security marker; a method of preparing same; the use of said security marker; a security article, document, or element comprising said marker; the use of said security article, document, or element; an object of value comprising said marker; a method of preparing said security article, document, or element or said object of value; a method for determining the authenticity of said security article, document, or element or said object of value; and a system for determining the authenticity of said security article, document, or element or said object of value.
Claims19
A security marker comprising:
- a glassy matrix comprising at least the elements silicon and oxygen;
- and
- a first crystalline phase formed by crystalline particles embedded in said matrix;
- wherein said particles are feldspars or feldspathoids;
- wherein the average size of said crystalline particles is less than 500 nm;
- and
- wherein an interface exists between the crystalline particles and the glassy matrix;
- and
- wherein the crystalline particles consist of aggregates or agglomerates of nanoparticles,
- wherein said nanoparticles have an average size between 1 and 50 nm;
- and
- wherein the crystalline particles of the first crystalline phase are formed by a material selected from the group consisting of orthoclase, sanidine, microcline, anorthoclase, albite, oligoclase, andesine, labradorite, banalsite, bytownite, anorthite, leucite, nepheline, analcime, cancrinite, hauyne, lazurite, nosean, sodalite, and combinations thereof;
- and
- wherein the security marker is in a powder state.
Dependencies are inferred from the claim text.