Figure 2From: Characterization of black pigment used in 30 BC fresco wall paint using instrumental methods and chemometry(a): PCA representation of scores of TG-DTG data of all powdered standard black pigments and of the black-ivory-(VS) considered as unknown pigment sample. (b): HCA representation of TG-DTG data of powdered standard black pigments and the considered unknown black pigment sample (i.e. black-ivory-(VS)).Back to article page