Optical deterioration of samples printed with basic Pantone inks

This study focuses on the research of changes in the optical characteristics of selected offset inks (Yellow, Red 032, Process Blue and Black) printed as a part of Pantone colour book. These changes that occur as a result of natural and accelerated ageing (caused by thermal and UV/VIS radiation) were observed through reflectance spectra in the visible region. A Pantone colour book is a system for identifying, matching and controlling ink colours in the graphic industry. This colour book is the international reference for accurate colour communication. The durability of colours and its unchanged quality play an important role in ensuring accurate colour communication and control. In order to examine optical modifications, the samples were exposed to elevated temperatures and UV/VIS lamp radiation. The FTIR spectroscopy was additionally used for the characterization of printed inks before and after ageing