Valuable document and security mark using a marking substance

Abstract

The invention relates to a document of value, a security element and a security marking that have a marking substance absorbing in the infrared spectral region between 1000 and 2500 nanometers which does not significantly absorb either in the visible spectral region or at 800 nanometers. Said marking substance is therefore not accessible with the widespread, simple IR readers working at about 800 nanometers. Preferably, an additional print is added that absorbs in the visible and also at about 800 nanometers but not in the range from 1000 to 2500 nanometers. According to the inventive checking method, the marked place is irradiated with infrared light from the range from 1000 to 2500 nanometers and the absorption determined.

Description

technical field

[0001] The invention relates to documents of value, security elements and security markings having a marking substance which absorbs light in the infrared spectral region, and also to a detection method and a device for carrying out this detection, the marking substance absorbing light in the visible region The interior has no appreciable absorption and is preferably very transparent. Such marking substances, for example contained in printing inks, can be used to form markings on any objects or their packaging, preferably in the field of authenticity or logistics, for example for detecting and tracking the movement of goods. Background technique

[0002] EP 0 340 898 B1 discloses a security code with two identification marks. A signature is substantially colorless and absorbs in the near infrared portion of the electromagnetic spectrum from 700 to 1500 nanometers. The first marking is overprinted with a second colored marking which is opaque in the visible ...

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