Table 2 Main elemental composition at different positions on the sample surface

From: Microscopic characteristics and weathering mechanism of pigment layers in Huashan Rock Art, Guangxi, China

EI

Atom. C (at.%)

Dot 1

Dot 2

Dot 3

Dot 4

S

26.44

17.79

1.66

0.80

Ca

69.27

67.07

86.98

89.29

Fe

0.26

5.13

Si

2.67

6.45

5.5

4.72

Al

0.87

2.18

1.42

1.06

Mg

0.50

3.88

4.13