The persistence of the footprint to external factors is crucial for the use of a particular product. Nowadays, natural pigments are increasingly used, as they are significantly more environmentally friendly than synthetic pigments. As part of the master's thesis, printing inks based on extracts of selected invasive plants were prepared and prints were made on various printed materials. Three types of paper were used for the printing material, namely: office paper, recycled paper and Japanese knotweed paper. The addition of inorganic white pigment (TiO2) was used in the preparation of the printing ink. The purpose of using the inorganic white pigment was to evaluate and study the possibility of improving color prints.
The main goal of the master's thesis is to study the durability of manufactured color prints on external factors (rubbing, light). The basic, surface and optical properties of individual types of paper were determined using standard methods. Imprint stability was optimized on individual samples marked V1 - V8. Color values and the resistance of prints to abrasion and light were measured using a spectrophotometer, which are presented in the experimental part. No significant changes were observed in the captured images using a scanning electron microscope (SEM) on samples V4, V5 and V6.
Based on the results, it can be confirmed that the addition of inorganic white pigment does not affect the mechanical stability of the impression. Unfortunately, this is not the case when improving the durability of the footprint. The addition of titanium dioxide deteriorated the durability of the prints, because the value of the color differences ΔE*ab were too high.