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Table 2 The chemical composition of N23 and N25 before and after treatment

From: The method to soften the concretions of ceramics in the “Nanhai I” Shipwreck of China Southern Song Dynasty (1127–1279AD)

Samples

Wt%

Na2O

MgO

Al2O3

SiO2

SO3

K2O

CaO

TiO2

Cr2O3

MnO

Fe2O3

CuO

N23 before

1.02

7.12

1.25

2.72

22.89

0.31

54.14

0.04

0.07

0.26

9.71

0.01

N23 after

1.38

2.04

8.76

37.45

16.17

1.05

1.37

0.51

0.02

0.16

30.95

0.01

N25 before

8.98

0.09

17.73

24.66

0.09

3.93

0.09

0.13

0.44

43.50

0.04

N25 after

4.46

6.53

2.30

10.30

16.08

0.30

7.68

0.12

0.10

0.39

51.32

0.04