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Colorimetric parameters measured on red bricks samples before and after 15 min immersion in specific dispersion.
| Sample | L* | a* | b* | ΔL* | Δa* | Δb* | ǀΔb*ǀ | Δbx | ΔEx | ΔE |
|---|---|---|---|---|---|---|---|---|---|---|
| Reference specimen | 76.44 | 4.35 | 1.31 | −16.98 | 4.90 | −2.00 | 2.00 | - | 17.79 | - |
| MgO + NaPAC16 | 76.28 | 4.52 | 1.48 | −17.14 | 5.07 | −1.83 | 1.83 | −0.18 | 17.97 | 0.18 |
| TiO2 + NaPAC16 | 76.06 | 4.45 | 1.25 | −17.36 | 5.01 | −2.05 | 2.05 | 0.05 | 18.18 | 0.39 |
