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Table 2 SEM/EDS data and expressed as normalized wt%. Numbers within brackets refer to layers in Fig. 7

From: The Samuel F. B. Morse statue in Central Park: scientific study and laser cleaning of a 19th-century American outdoor bronze monument

  S Fe Cu Sn Zn SiO2 Al2O3 K2O P2O5 SO3 Cl FeO CuO SnO2
Bare alloy (1)    91.0 6.4 2.6          
Red corrosion layer (2)           0.8 1.0   85.5 12.5
Green corrosion layer (3)       0.2    0.3 18.1 0.1 0.5 55.8 25.1
Very thin green
corrosion layer (4)
      1.6 0.9 0.2 0.3 23.5 2.2 0.5 70.3 0.6
Copper sulfide particle 21.4 0.2 78.4            
Zinc sulfide particle 33.1 0.3 4.4   62.2          
Zinc sulfide particle 32.9 0.6 5.7 0.3 60.5          
Zinc sulfide particle 33.1 0.4 4.2 0.2 62.1          
Zinc sulfide particle 34.1 0.5 4.9   60.6          
Zinc sulfide particle 33.6 0.4 4.0   62.0