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Table 1 The first oxidation product is Ag2O that by ligand substitution is converted into Ag2S

From: Silver paints in medieval manuscripts: a first molecular survey into their degradation

  E°/V ΔG°/kJ/mol
O2 (g) + 4Ag (s) → 2Ag2O (s) 0.43 − 22.42
Ag2O (s) + H2S (g) → Ag2S (s) + H2O (aq) − 233.26
Ag2O (s) + COS (g) → Ag2S (s) + CO2 (g) − 256.94
  1. ΔG° value calculated with reference data from [43]