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The overpainted layers reveal the artist’s working process, the way he created his work in different phases until the final painting. Photographing paintings in near-infrared spectrum (NIR/IR reflectography) also provides protection against counterfeit art paintings. This paper investigates the intrinsic properties of colorant twins based on the InfraredArt theory, which expands the knowledge about the light absorption response in the visual (V) and near-infrared spectrum (NIR). The key support for the establish...

A postage stamp is a security that goes down in history. The stamp we are presenting was designed and issued in Croatia, EU, on 24 September 2021, on the occasion of the 100th anniversary of the Otorhinolaryngology Clinic in Croatia. This stamp contains new values through IRD, and that is exactly what we show and offer to philatelists. The stamp "100 years of otorhinolaryngology" has artistic beauty and scientific innovation in the development of twin colorants. In the visual solution of the stamp are embedded hid...