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Table 2 Elemental results of the ancient lacquer films

From: pH-dependent warping behaviors of ancient lacquer films excavated in Shanxi, China

  C N O Al Si Ca
Original external surface 65.4 ± 0.5 4.9 ± 0.5 26.9 ± 0.5 0.5 ± 0.2 1.4 ± 0.3 0.8 ± 0.2
Original external surface
(Al, Si excluded)a
69.4 ± 1.3 5.2 ± 0.5 24.5 ± 0.8 / / 0.9 ± 0.2
Original internal surface 66.4 ± 6.6 2.6 ± 0.2 27.1 ± 4.5 0.7 ± 0.7 2.1 ± 1.7 1.0 ± 0.1
Original internal surface
(Al, Si excluded)
72.4 ± 1.6 2.9 ± 0.1 23.6 ± 1.6 / / 1.1 ± 0.1
Acidified external surface 66.1 ± 1.7 5.8 ± 1.1 25.7 ± 0.8 0.5 ± 0.2 1.8 ± 0.5 0.1 ± 0.1
Acidified external surface (Al, Si excluded) 70.7 ± 1.6 5.9 ± 1.5 22.6 ± 1.3 / / 0.1 ± 0.1
Acidified internal surface 66.2 ± 4.8 3.3 ± 0.2 27.3 ± 3.2 0.9 ± 0.6 2.2 ± 1.0 0.1 ± 0.1
Acidified internal surface
(Al, Si excluded)
72.7 ± 1.8 3.7 ± 0.3 23.5 ± 1.6 / / 0.1 ± 0.1
  1. aAl and Si are excluded and O content is reduced accordingly considering the ratio of O/(Al, Si) is 2 in common silicates like quartz, feldspar and mica