Table 3. Relative sugar composition of tragacanth 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 | 29.2 | 47.7 | 1.5 | 11.1 | - | - | 0.0 | 10.5 | GCI | 1.00 | T |
| n | 23.5 | 40.2 | 2.3 | 8.0 | 14.1 | 0.6 | 0.0 | 11.3 | DCCI | 1.00 | T | |
| W | 29.3 | 47.1 | 1.6 | 11.1 | - | - | 0.0 | 10.9 | GCI | 1.00 | T | |
| O | 29.7 | 46.9 | 1.6 | 10.9 | - | - | 0.0 | 11.0 | GCI | 1.00 | T | |
| SB 2 | 22.5 | 39.0 | 3.4 | 8.3 | 15.1 | 0.4 | 0.0 | 11.1 | DCCI | 1.00 | no | |
| C (vine black) | n | 28.5 | 47.4 | 1.7 | 11.0 | - | - | 0.0 | 11.3 | GCI | 1.00 | T |
| W | 27.8 | 44.9 | 4.6 | 10.8 | - | - | 0.0 | 12.0 | GCI | 1.00 | T | |
| O | 28.6 | 45.5 | 3.6 | 10.7 | - | - | 0.0 | 11.7 | GCI | 1.00 | T | |
| Pb (lead white) | n | 24.7 | 54.7 | 1.2 | 16.1 | - | - | 0.0 | 3.3 | GCI | 0.97 | T |
| W | 25.4 | 53.2 | 1.1 | 14.7 | - | - | 0.0 | 5.6 | GCI | 0.98 | T | |
| O | 29.7 | 49.4 | 1.7 | 12.5 | - | - | 0.0 | 6.7 | GCI | 1.00 | T | |
| Pb (minium) | n | 33.0 | 39.1 | 2.9 | 7.4 | 1.4 | 0.6 | 0.0 | 15.6 | DCCI | 0.92 | T |
| SB 1 | 30.9 | 41.3 | 3.4 | 7.0 | 0.9 | 0.3 | 0.0 | 16.2 | DCCI | 0.92 | no | |
| SB 2 | 16.2 | 59.5 | 3.1 | 5.3 | 0.2 | 0.1 | 0.0 | 15.6 | DCCI | 0.91 | no | |
| Hg (vermilion) | n | 27.6 | 49.6 | 1.6 | 10.5 | - | - | 0.0 | 10.6 | GCI | 1.00 | T |
| W | 25.9 | 51.7 | 2.0 | 10.0 | - | - | 0.0 | 10.4 | GCI | 0.99 | T | |
| O | 28.5 | 47.7 | 2.7 | 8.8 | - | - | 0.0 | 12.3 | GCI | 1.00 | T | |
| Si (ultramarine) | n | 20.3 | 57.1 | 1.2 | 16.6 | - | - | 0.0 | 4.8 | GCI | 0.95 | T |
| W | 18.7 | 59.1 | 0.8 | 14.6 | - | - | 0.0 | 6.9 | GCI | 0.95 | no | |
| O | 24.1 | 54.8 | 1.2 | 13.9 | - | - | 0.0 | 6.0 | GCI | 0.98 | T | |
| n | 25.2 | 45.8 | 3.0 | 9.5 | 0.2 | 0.3 | 0.0 | 16.0 | DCCI | 0.93 | no | |
| SB 1 | 20.1 | 46.2 | 2.6 | 4.1 | 0.0 | 0.0 | 0.0 | 27.0 | DCCI | 0.87 | no | |
| SB 2 | 25.6 | 47.5 | 3.0 | 8.4 | 0.0 | 0.2 | 0.0 | 15.2 | DCCI | 0.94 | no | |
| Fe (yellow ochre) | n | 27.3 | 50.8 | 1.3 | 12.5 | - | - | 0.0 | 8.1 | GCI | 0.99 | T |
| W | 27.7 | 46.8 | 3.9 | 11.0 | - | - | 0.0 | 10.5 | GCI | 1.00 | T | |
| O | 27.8 | 44.7 | 3.6 | 10.8 | - | - | 0.0 | 13.1 | GCI | 1.00 | T | |
| Fe (red bole) | n | 30.5 | 37.9 | 2.6 | 12.3 | 4.1 | 0.4 | 0.0 | 12.2 | DCCI | 0.94 | no |
| SB 1 | 26.5 | 39.4 | 3.5 | 10.4 | 5.1 | 0.0 | 0.0 | 14.9 | DCCI | 0.96 | no | |
| SB 2 | 29.1 | 43.4 | 2.9 | 11.3 | 0.1 | 0.2 | 0.3 | 12.6 | DCCI | 0.93 | no | |
| Cu (malachite) | n | 7.2 | 72.0 | 0.9 | 18.6 | - | - | 0.0 | 1.3 | GCI | 0.85 | no |
| W | 3.3 | 71.2 | 1.4 | 23.7 | - | - | 0.0 | 0.5 | GCI | 0.80 | T | |
| O | 10.1 | 67.9 | 1.8 | 20.2 | - | - | 0.0 | 0.0 | GCI | 0.86 | T | |
| Cu (copper acetate) | n | 13.2 | 37.8 | 5.6 | 3.2 | 4.6 | 9.2 | 0.0 | 26.5 | DCCI | 0.78 | T |
| SB 1 | 9.7 | 41.5 | 6.8 | 3.5 | 3.1 | 4.7 | 0.0 | 30.8 | DCCI | 0.75 | T | |
| SB 2 | 10.9 | 47.6 | 4.1 | 2.1 | 0.4 | 3.1 | 0.0 | 31.8 | DCCI | 0.77 | no |
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.