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Table 2 Semi quantitative analysis results of SEM–EDS(wt %)

From: Guangzhou Tongcao painting in late China Qing Dynasty (1840–1912 AD): technology revealed by analytical approaches

Samples X0 X1 X2 X3 Q0 Q1 Q2
Al 0.06 0.22 0.44 0.38 0.17 0.12 1.43
S 0.07 0.32 1.14 1.13 0.10 0.26 0.85
K 0.15 0.19 0.14 0.16 0.17 0.11 0.18
Pb / / / / / / 32.1
Ca 1.05 0.64 0.69 0.57 2.32 1.14 2.84