Table 2 Elemental results of the ancient lacquer films
From: pH-dependent warping behaviors of ancient lacquer films excavated in Shanxi, China
| Â | 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 |