Fig. 10

Graphic representation of L*, C*_ab and h_ab from the brown tesserae (br) after each cleaning process: the surface a with a 6-week deposit layer (m₀), b after brushing (m₁) and c after mopping (m₂). The mean L*C*h_ab values are represented by (●). The mean values of the previous cleaning stages are represented by (x) and (o) so it is easier to clearly determine the shift (Table 1)