From: The synergistic effect of an imidazolium salt and benzotriazole on the protection of bronze surfaces with chitosan-based coatings
L*
a*
b*
ΔE*
Bronze
13.56
7.52
20.03
–
CHT
12.28
7.68
20.29
1.3
CHT/BTA
8.39
8.79
22.17
5.7
CHT/IS
10.93
9.21
21.19
3.3
CHT/BTA-IS
11.98
7.24
20.64
1.7