Jozef Stefan Institute

Ellettra-sincrotrone Trieste Societa' Consortile Per Azioni

Elettra-sincrotrone Trieste Societa' Consortile Per Azioni

Elettra - Sincrotrone Trieste S.c.p.a.

Luca Gregoratti

Danjela Kuscer Hrovatin

Marija Kosec

Marco Peloi

Giuseppina Palma

Matteo Maria Dalmiglio

It is describes a material in the form of lithium fluoride powder containing color centers and the method for its preparation, by the formation of color centers based on irradiating the powder with synchrotron radiation (light). The method involves mechanically reducing the size of the particles that form the LiF powder and the formation of color centers therein by its exposure to synchrotron radiation. The so activated powder, which maintains the transparency characteristics of the original material if exposed to sunlight, can find wide use as an additive both in common printing inks and in pigments used in the artistic field to be used for the formation of marks on artifacts for anti-counterfeiting/identification purposes.

Material in the form of lithium fluoride powder containing colour centres, method for preparation and use thereof

The invention relates to a method for marking an item based on the formation of color centers on a lithium fluoride film. The method provides for the deposition of thin LiF films on the item or on mark supports to be applied to the item and the formation of the color centers by irradiation, thus forming an identification mark. Optionally, the method may provide for the detection of the identification mark and the control of its authenticity. The method may be employed both to guarantee the authenticity of the item and to classify it. The application of the method is particularly advantageous in the field of high value goods and specifically in the field of cultural objects.

Method for marking an item based on colour centres

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Bagnaria Arsa, Italy

Luca Gregoratti