A multi-analytical study of rock paintings from Leandro 5 megalithic barrow, North-Western Portugal

Abstract

The colourant composition of a northern Portugal megalithic barrow decorated with 'solar' motifs was studied using a multi-analytical approach, allowing the characterisation of the painting techniques, pigments and binders. The red pigment was prepared with iron oxide minerals, using vegetal oils as organic additives, while the black pigment was charcoal without any organic additives or binders. The solar motif was first drawn with charcoal and subsequently painted with a red pigment.