Skip to main content

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