Direct Analysis in Real Time Mass Spectrometry for the Nondestructive Investigation of Conservation Treatments of Cultural Heritage

Figure 5

Score plot of PC1, PC2, and PC3 (a). The samples are separated along the three PCs in three clusters: untreated parchment sample (red), the parchment sample treated with castor oil (blue) and the parchment sample treated with glycerol (green). (b) represents the score plot of PC1 and PC2.

(a)

(b)