Table 1 Colour changes (ΔE) of the Calcare di Altamura (C), Calcarenite di Gravina from Massafra (M), and Calcarenite di Gravina from Gravina (G) specimens treated with Estel1000 and Silo111 with and without ZnO-NPs (0.5 % w/w) measured at 2 h, 14 days, and 38 days after application
From: Development of a novel conservation treatment of stone monuments with bioactive nanocomposites
2 h | 14 days | 38 days | ||||
|---|---|---|---|---|---|---|
Without ZnO | ZnO 0.5 % w/w | Without ZnO | ZnO 0.5 % w/w | Without ZnO | ZnO 0.5 % w/w | |
C + Estel1000 | 10.9 ± 0.7 | 10.4 ± 0.5 | 7.1 ± 0.7 | 6.8 ± 0.5 | 4.4 ± 0.4 | 3.6 ± 0.5 |
C + Silo111 | 5.0 ± 0.7 | 6.3 ± 0.7 | 1.8 ± 1.0 | 1.2 ± 0.2 | 4.4 ± 0.4 | 1.1 ± 0.3 |
M + Estel1000 | 12 ± 2 | 10.1 ± 0.5 | – | 5.9 ± 1.0 | 4.1 ± 0.9 | 2.9 ± 0.7 |
M + Silo111 | 5.4 ± 0.5 | 3.4 ± 0.9 | – | 1.5 ± 0.3 | 1.0 ± 0.2 | 1.0 ± 0.2 |
G + Estel1000 | 7.9 ± 1.7 | 10.2 ± 0.8 | 3.4 ± 0.8 | 5.8 ± 1.2 | 0.8 ± 0.5 | 2.8 ± 1.5 |
G + Silo111 | 1.8 ± 0.2 | 4 ± 3 | 5 ± 3 | 2.5 ± 0.6 | 0.7 ± 0.8 | 0.7 ± 0.4 |