Table 4. Variation of a*, b* and L* between aged and pristine Cu-based surfaces (CIELab color space).
| ΔL* | Δa* | Δb* | ΔE | |
|---|---|---|---|---|
| Cu R | -36.10 | -5.15 | 13.28 | 38.81 |
| Cu R+A | -26.25 | -1.33 | -0.33 | 26.29 |
| Cu15Zn | -32.47 | 0.47 | -9.22 | 33.76 |
| Cu18Ni20Zn | -1.57 | -1.15 | -1.24 | 2.31 |
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