Multi-analytical characterization of rupestrian precolonial paintings of Inhuma, Piauí, Brazil - Moura, Jacira Isidório de; Lage, Maria Conceição Soares Meneses; Farias Filho, Benedito Batista; Faria, Dalva Lúcia Araújo de; Barros, Wilkins O. de; Loureiro, Hugo Campos (Journal of the Brazilian Chemical Society, 2023)