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

Figure 4

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

(a)

(b)