Pigment spectroscopy analyses in Maltravieso cave, Spain

Abstract

Maltravieso cave (Estremadura, Spain) was recently the subject of ATR-FTIR spectroscopy of 8 figures (four hand stencils, a red horse figure, a black bull figure, a pair of black lines, and a pair of brown lines). These artistic representations are composed of different colors including red, brown, and black figures. The analyses showed that different naturally occurred material compounds in the cave (such as kaolinite) were used in the creation of the ochre to obtain different hues. Hand stencils are made of earth pigment that is naturally present in the cave which contained hematite, magnetite, and goethite as chromophores material. The red horse figure was made with kaolinite-based ochre. The black bull figure was made with charcoal (identified with Raman spectroscopy). The pigmental composition analyses show that they are composed of the same natural matter found inside the cave. Our results suggest that different paintings in the cave have been produced by different techniques and these techniques are linked to different chronological periods.