foxing

In the context of archival preservation and book collecting, this term describes a specific type of chemical degradation. It is distinct from general staining or water damage, as it refers specifically to the characteristic rusty-brown spots that emerge over time. Collectors often distinguish between foxing caused by fungal growth and that caused by metallic impurities in the paper pulp.

When referring to the sport of hunting, the term is used as a gerund to describe the activity itself. In this sense, it carries a traditional, often aristocratic connotation, specifically associated with the English countryside and the use of scent hounds.