Table 4 Colorimetric (CIELab) data of all standard frescoes fabricated using standard black pigments and the considered unknown black pigment (i.e. black-ivory-(VS)).
Identification of CIELab parameters of standard black pigments in a standard frescoes | ||||
|---|---|---|---|---|
Sample | Illuminating | L | a* | b* |
Black-Ivory | D 65 D 50 | 29.71±1.34 27.44±2.57 | 0.11±0.02 0.08±0.03 | -0.29±0.09 -0.37±0.16 |
Black-Carbon P | D 65 D 50 | 33.12±1.11 32.87±0.54 | -0.29±0.03 -0.76±0.03 | -3-15±0.24 -3.33±0.21 |
Black-Carbon Z | D 65 D 50 | 41.28±0.65 40.96±0.61 | -0.44±0.02 -1.05±0.04 | -4.15±0.09 -4.24±0.15 |
Black-Vine | D 65 D 50 | 29.15±0.61 29.37±0.46 | 0.16±0.02 0.21±0.03 | 0.38±0.14 0.35±0.12 |
Black-Ivory VS | D 65 D 50 | 29.41±0.34 27.81±0.46 | 0.21±0.04 0.23±0.03 | 0.35±0.14 0.44±0.12 |
Measurements performed by spectrophotometer Minolta CM2600d, standard observatory 2°, MAV mask. Illuminants: D 65 (European standard) and D 50 (American standard). | ||||