Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. condition changing (processes)
6. deterioration
7. degradation

Additional parents:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques
4. processes and techniques by specific type
5. physicochemical processes

Anotations

Scope note:

Degradation of a material caused by exposure to light, specifically the chemical changes to photodegradable molecules induced by absorption of photons, especially those wavelengths found in sunlight. The process by which a material is damaged due to prolonged exposure to ultraviolet radiation.