Fig. 4
From: A new multi-analytical procedure for radiocarbon dating of historical mortars
Results of non-destructive techniques on powders (b-d) and lump selection points (a). Plot of ν2 and ν4 with typical trend lines of geogenic and anthropogenic calcites obtained by ATR-FTIR and TC lump samples (b); OM-CL photomicrographs of lump powders: an anthropogenic sample (TC26L1) and a geogenic sample (TC26L3) (c); comparison among individual Raman spectra of carbonate samples: geogenic calcite (in blue, a reference sample) and anthropogenic calcite of TC samples (1: TC26L1; 2: TC26L2; 3: TC26L4; 4: TC27L1) (d).
