In case of such objects; non-destructive methods should be applied for analysing the components. Thus; portable XRF was applied abreast with SEM-EDX in order to point out the chemical composition of the pigment materials. Based on the data obtained from the XRF analysis; it has been concluded that the pigments were not applied directly into the surface of the limestone, but a thin layer of gypsum (CaSO4.2H2O) whitewash was applied first (Fig. 11).