IDENTIFICATION OF COLOR RANGES PRODUCED WITH INORGANIC PIGMENTS FROM THE CUZCO AREA - PERU

Povzetek

Mineral pigments extracted from the immediate territory have been used throughout history in the architecture and mural paintings of Cuzco in Peru. This study aims to characterize the visual aspect in the NCS color notation system of the paintings produced from inorganic pigments extracted from quarries in the city of Cuzco. These are compared according to their crushing process by sedimentation (MS) or ball milling (MG) and according to three types of dosages at 10%, 40%, and 60%, using polyvinyl acetate (PVA) as a binder for the mixture. The results indicate that most of the color ranges obtained are reddish (Y20R to Y80R) with the exception of a greenish yellow (G90Y), have low to middle blackness (10 to 50) and low chromaticcness (<=30). The use of MS compared to MG process alters the visual aspect of paintings in an unpredictable way in 40% of the cases, with independency of the dosage. Although the PVA content does not result in significant changes in the perception of hue, blackness levels, or chromaticness in more than 50% of the samples, it slightly influences certain pigment and extraction method combinations. It was observed that paints with higher proportions of PVA, especially in pigments processed by sedimentation (MS), tend to exhibit more reddish Hues and less blackness compared to those obtained by ball milling (MG). Furthermore, increased PVA often intensifies chromaticcness in some samples, such as M-01 and M-07, highlighting its role as a regulator of the visual properties of the coatings.