Table 4 Comparative analysis of the effects of oregano, moringa and cinnamon essential oils on colour values of different pigments using experimental painting samples
Pigment | Treatment | L | a | b | ΔL | Δa | Δb | ΔE |
|---|---|---|---|---|---|---|---|---|
White | Control | 85 | -2 | 14 | - | - | - | - |
| Â | Oregano | 84 | -1 | 15 | -1 | 1 | 1 | 1.73 |
| Â | Moringa | 82 | 1 | 16 | -3 | 3 | 2 | 4.69 |
| Â | Cinnamon | 80 | 0 | 22 | -5 | 2 | 8 | 9.64 |
Yellow | Control | 36 | 4 | 44 | - | - | - | - |
| Â | Oregano | 34 | 6 | 44 | -2 | 2 | 0 | 2.83 |
| Â | Moringa | 52 | 7 | 45 | 16 | 3 | 1 | 16.31 |
| Â | Cinnamon | 40 | 8 | 40 | 4 | 4 | -4 | 6.93 |
Red | Control | 31 | 18 | 17 | - | - | - | - |
| Â | Oregano | 29 | 17 | 15 | -2 | -1 | -2 | 3.00 |
| Â | Moringa | 25 | 16 | 13 | -6 | -2 | -4 | 7.48 |
| Â | Cinnamon | 25 | 14 | 14 | -6 | -4 | -3 | 7.81 |
Black | Control | 7 | -1 | 0 | - | - | - | - |
| Â | Oregano | 6 | 0 | 0 | -1 | 1 | 0 | 1.41 |
| Â | Moringa | 5 | -2 | 1 | -2 | -1 | 1 | 2.45 |
| Â | Cinnamon | 5 | 0 | 1 | -2 | 1 | 1 | 2.45 |