Table 1 Mean lightness (L*), chroma (C*ab) and hue angle (hab(º)) for the white (wh), ochre (oc) and brown (br) tesserae before and after the cleaning process (m0 = dirty, m1 = dry cleaning, m2 = wet cleaning), according to the CIELAB color space (CIE 1976 L*a*b*)
Tesserae | Cleaning stage | \(\overline{L^*}\) (σ) | \(\overline{{C}^*_{\text{ab}}}\) (σ) | \(\overline{{\text{h}}_{\text{ab}}}\)(º) (σ) |
|---|---|---|---|---|
White (wh) | m0 | 74.32 (2.82) | 17.44 (3.94) | 103.65 (21.11) |
m1 | 76.84 (3.20) | 14.29 (3.93) | 98.34 (25.65) | |
m2 | 79.48 (1.93) | 11.38 (1.90) | 97.83 (12.21) | |
Ochre (oc) | m0 | 57.80 (3.22) | 17.13 (3.86) | 72.11 (23.00) |
m1 | 54.99 (3.23) | 18.94 (4.68) | 54.76 (23.74) | |
m2 | 52.50 (2.01) | 22.63 (2.02) | 47.00 (5.33) | |
Brown (br) | m0 | 49.03 (7.18) | 13.60 (4.72) | 90.86 (34.03) |
m1 | 45.53 (5.53) | 13.65 (6.02) | 59.74 (46.77) | |
m2 | 43.95 (1.83) | 13.17 (2.00) | 42.21 (11.13) |