Table 2.
Influence of biodeposition treatment on the visual aspect of different types of stonea
| Stone and treatment | L* | a* | b* | ΔE* |
|---|---|---|---|---|
| Massangis | ||||
| None | 75.5 ± 2.1 | 2.0 ± 0.6 | 9.1 ± 1.2 | |
| Biodeposition | 62.8 ± 1.2 | 4.4 ± 0.4 | 16.0 ± 1.1 | 14.6 ± 1.6 |
| Aubigny | ||||
| None | 75.6 ± 3.0 | 3.5 ± 0.7 | 12.5 ± 1.4 | |
| Biodeposition | 64.7 ± 1.8 | 5.7 ± 0.5 | 18.1 ± 0.8 | 12.4 ± 2.2 |
| Euville | ||||
| None | 78.3 ± 1.0 | 2.6 ± 0.2 | 10.6 ± 0.9 | |
| Biodeposition | 69.7 ± 1.3 | 4.6 ± 0.5 | 16.3 ± 0.7 | 7.3 ± 1.0 |
| Savonnières | ||||
| None | 78.3 ± 2.2 | 2.1 ± 0.4 | 11.5 ± 0.7 | |
| Biodeposition | 66.4 ± 1.6 | 4.3 ± 0.3 | 16.5 ± 1.1 | 13.1 ± 1.8 |
| Avesnes | ||||
| None | 77.5 ± 1.9 | 1.7 ± 0.6 | 14.8 ± 1.2 | |
| Biodeposition | 70.2 ± 2.5 | 2.5 ± 0.6 | 17.5 ± 2.3 | 7.9 ± 2.1 |
a
A decrease in the L* value indicates a darkening of the surface. Increases in the a* and b* values correspond to shifts toward red and yellow, respectively. Values are means ± the standard errors of the means.