Fig. 4From: Looking for paint mixtures to glimpse pictorial techniques: a micro-stratigraphic physicochemical approach to the rock art from the Oyola’s Caves (Argentina)mRS analyses of black paintings at Oyola 34 showing the bands of gypsum (G). a Raman spectrum from pictorial layer from sample 329-34-1 and, b from sample 329-34-13Back to article page