Fig. 4
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 329-34-13
Fig. 4 | Heritage Science
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 329-34-13