Economic and Environmental Geology

Table. 7.

Table. 7.

Results of color difference of Massicot under the various environmental test

Test Before After ΔE
L* a* b* STDEV (n=9) L* a* b* STDEV (n=9)
UV 74.37 -7.82 30.28 0.6 47.25 -3.87 14.34 2.0 31.71
CO2 77.35 -8.83 32.86 0.4 77.81 -8.97 33.16 0.5 0.58
NO2 80.28 -8.51 35.65 0.2 85.07 -8.45 38.64 0.4 5.65
salt spray 78.30 -8.74 33.39 0.7 69.02 -0.52 1.73 2.5 34.00
Econ. Environ. Geol. 2022;55:281-93 https://doi.org/10.9719/EEG.2022.55.3.281
© 2022 Econ. Environ. Geol.