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Table 2 Mean differences of lightness (∆L’), chroma (∆C’), hue (∆H’) and color (∆E00) along the cleaning processes for the white (wh), ochre (oc) and brown (br) tesserae according to the standard CIEDE2000

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

Tesserae (n) \(\overline{\text{L}^{\prime}}\) \(\overline{\text{C}^{\prime}}\) \(\overline{\text{H}^{\prime}}\) \(\overline{{\text{E}}_{00}}\)
White (wh) 1 (m1-m0) 2.52 - 3.21 − 1.99 4.63
2 (m2-m0) 5.16 - 6.93 − 1.63 7.63
Ochre (oc) 1 (m1-m0) − 2.81 3.24 − 6.63 7.57
2 (m2-m0) − 5.29 7.67 − 9.91 11.70
Brown (br) 1 (m1-m0) − 3.51 1.81 − 9.61 11.66
2 (m2-m0) − 5.08 1.50 − 13.48 15.03
  1. (n): Combinations for the calculation of ∆ depending on the cleaning stage. LumiCam® color uniformity =  ± 0.001 (average of 10 × 10 pixels)