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Colorimetric parameters measured on the stone fragments before and after immersion coating.
| Sample | L* | a* | b* | ΔL* | Δa* | Δb* | ΔEx | ΔE |
|---|---|---|---|---|---|---|---|---|
| Limestone 1 | 83.24 | 1.02 | 1.03 | −10.18 | 1.57 | −2.28 | 10.54 | |
| Limestone 1 coated with MgO-NaPAC16 |
82.86 | 1.19 | 0.99 | −10.56 | 1.73 | −2.31 | 10.95 | 0.41 |
| Limestone 2 | 84.39 | 0.99 | 3.74 | −9.03 | 1.54 | 0.44 | 9.17 | |
| Limestone 2 coated with TiO2—NaPAC16 |
84.14 | 1.14 | 3.97 | −9.28 | 1.69 | 0.67 | 9.46 | 0.29 |
