1. Trees, bunches, cauliflowers – a closer look at sulphurous corrosion on copper alloys and minerals (‘black spots’);Weichert,2004
2. Sulfur, the ‘enemy of copper’: replication of sulfurous efflorescence on copper-based heritage materials with elemental sulfur;Kuhn-Wawrzinek,2022
3. Black spots on bronzes – a microbiological or chemical attack;Madsen,1979
4. Unusual Phenomena in the Corrosion of Ancient Bronzes;Oddy,1982
5. Black spots on bronze and elemental sulfur;Eggert,1999