Applications Of Fourier-Transform Infrared Spectroscopy (Ft-Ir) To The Study Of Pastes From An Argentinian Septentrional Patagonian Archaelogical Site.

MAIER, MARTA; BOSCHÍN, MARÍA TERESA; PARERA, SARA; DEL CASTILLO, FLORENCIA

Proceeding of the Sixth Infrared and Raman Users Group Conference

Marcello Picollini

Lugar: Padova; Año: 2005; p. 276 - 280

Two samples of residuals of red pastes (crayons) obtained from the archaeological site Cave Loncomán (Río Negro, Argentina) were analyzed by Fourier-transform infrared spectroscopy (FT-IR) and gas chromatography coupled to mass spectrometry (GC-MS) revealing the presence of hematite as the red pigment and lipids as binders. Analysis of organic extracts of both pastes showed the presence of sharp peaks due to carboxylic acids and carboxylate peaks, indicative of hydrolysis of triglycerides in the pastes.