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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*)

From: Colorimetry to assess the visual impact of dust deposition on mosaics at sheltered archaeological sites

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)
  1. σ: Standard deviation