Table 2. Relative sugar composition of arabic gum paint replicas analysed, in relation to the pigment present, and ageing (the results are the averages of three replicates).
| Pigment | ageing | xylose | arabinose | rhamnose | fucose | galacturonic acid | glucuronic acid | mannose | galactose | method | correlation coefficient | decisional scheme |
| - | n | 0.2 | 37.2 | 18.3 | 0.1 | - | - | 0.0 | 44.3 | GCI | 1.00 | A |
| n | 0.0 | 25.7 | 13.3 | 0.0 | 0.0 | 11.7 | 0.0 | 49.3 | DCCI | 1.00 | A | |
| W | 0.2 | 37.8 | 18.7 | 0.1 | - | - | 0.0 | 43.1 | GCI | 1.00 | A | |
| O | 0.6 | 39.9 | 19.4 | 0.0 | - | - | 0.0 | 40.2 | GCI | 0.99 | A | |
| SB 2 | 0.0 | 36.0 | 17.7 | 0.0 | 0.0 | 11.2 | 0.0 | 48.7 | DCCI | 0.99 | A | |
| Hg (vermilion) | n | 0.4 | 38.8 | 18.5 | 0.1 | - | - | 0.0 | 42.2 | GCI | 1.00 | A |
| W | 0.6 | 39.9 | 19.3 | 0.0 | - | - | 0.0 | 40.2 | GCI | 0.99 | A | |
| O | 0.6 | 38.8 | 17.9 | 0.2 | - | - | 0.0 | 42.6 | GCI | 1.00 | A | |
| Si (ultramarine) | n | 0.3 | 42.1 | 23.8 | 0.0 | - | - | 0.0 | 33.8 | GCI | 0.95 | A |
| W | 0.6 | 43.7 | 21.6 | 0.0 | - | - | 0.0 | 34.2 | GCI | 0.95 | A | |
| O | 0.3 | 42.0 | 21.3 | 0.3 | - | - | 0.0 | 36.2 | GCI | 0.97 | A | |
| n | 0.3 | 31.3 | 16.5 | 0.0 | 0.0 | 9.7 | 0.2 | 42.0 | DCCI | 0.98 | A | |
| SB 1 | 0.3 | 30.6 | 14.1 | 0.0 | 0.0 | 3.6 | 0.2 | 51.2 | DCCI | 0.98 | A | |
| SB 2 | 0.4 | 28.4 | 12.5 | 0.0 | 0.0 | 7.4 | 0.2 | 51.1 | DCCI | 0.99 | A | |
| Cu (malachite) | n | 0.2 | 37.0 | 19.4 | 0.0 | - | - | 0.0 | 43.5 | GCI | 1.00 | A |
| W | 0.6 | 36.3 | 19.0 | 0.0 | - | - | 0.0 | 44.1 | GCI | 1.00 | A | |
| O | 0.0 | 40.4 | 20.2 | 0.0 | - | - | 0.0 | 39.4 | GCI | 0.99 | A | |
| Cu (copper acetate) | n | 0.3 | 39.4 | 11.8 | 0.0 | 0.0 | 4.8 | 0.1 | 43.5 | DCCI | 0.94 | A |
| SB 1 | 0.5 | 31.9 | 11.5 | 0.0 | 0.0 | 7.2 | 0.2 | 48.7 | DCCI | 0.99 | A | |
| SB 2 | 0.1 | 31.9 | 8.9 | 0.0 | 0.1 | 6.2 | 0.1 | 52.7 | DCCI | 0.98 | A | |
| C (vine black) | n | 0.1 | 36.3 | 16.4 | 0.1 | - | - | 0.1 | 46.9 | GCI | 1.00 | A |
| W | 0.0 | 36.6 | 16.1 | 0.0 | - | - | 0.2 | 47.0 | GCI | 1.00 | A | |
| O | 0.0 | 36.1 | 16.6 | 0.1 | - | - | 0.1 | 47.2 | GCI | 1.00 | A | |
| Pb (lead white) | n | 0.7 | 54.9 | 26.9 | 0.2 | - | - | 0.0 | 17.3 | GCI | 0.73 | A |
| W | 0.3 | 46.2 | 22.8 | 0.2 | - | - | 0.0 | 30.5 | GCI | 0.92 | A | |
| O | 0.3 | 47.3 | 23.1 | 0.0 | - | - | 0.0 | 29.3 | GCI | 0.90 | A | |
| Pb (minium) | n | 0.4 | 33.7 | 15.5 | 0.0 | 0.0 | 11.8 | 0.2 | 38.3 | DCCI | 0.96 | A |
| SB 1 | 0.1 | 25.3 | 14.2 | 0.0 | 0.0 | 7.8 | 0.1 | 52.5 | DCCI | 1.00 | A | |
| SB 2 | 0.1 | 26.2 | 10.9 | 0.0 | 0.0 | 11.9 | 0.1 | 50.8 | DCCI | 1.00 | A | |
| Fe (yellow ochre) | n | 0.1 | 36.0 | 16.5 | 0.1 | - | - | 0.1 | 47.2 | GCI | 1.00 | A |
| W | 0.1 | 36.0 | 16.9 | 0.1 | - | - | 0.2 | 46.8 | GCI | 1.00 | A | |
| O | 0.0 | 35.4 | 16.2 | 0.1 | - | - | 0.1 | 48.1 | GCI | 1.00 | A | |
| Fe (red bole) | n | 0.2 | 23.0 | 11.9 | 0.0 | 0.0 | 8.7 | 0.4 | 55.8 | DCCI | 0.99 | A |
| SB 1 | 0.0 | 29.6 | 16.9 | 0.0 | 0.0 | 3.5 | 0.0 | 50.0 | DCCI | 0.98 | A | |
| SB 2 | 0.1 | 26.7 | 12.2 | 0.0 | 0.1 | 11.4 | 0.1 | 49.4 | DCCI | 1.00 | A |
Arabic (A), tragacanth (T), fruit tree (cherry tree) (F, natural ageing (n), artificial ageing in solarbox (sb), weatherometer (w), and thermal (t). natural, at GCI (2 years) – n; natural, at DCCI (2 years) – n; artificial in the oven for 6 weeks – O; artificial in the Weatherometer for 6 weeks – W; artificial in the Solar box for 1 week – SB 1; artificial in the Solar box for 4 weeks – SB 2.