Hierarchy classification:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Conditions and Effects (hierarchy name)
4. [conditions and effects by specific type]
5. patina (condition)

Anotations

Scope note:

A biological treatment for copper alloys involving the conversion of existing corrosion patinas into more stable copper oxalates using the unique properties of carefully selected fungal strains. The cooper oxalate forms a protective layer that passivates the surface to prevent any exchange of copper ions and water.