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. damage (condition)
6. stains (damage)

Anotations

Scope note:

Discolorations appearing as irregular dark lines on paper or board, created by a dried liquid. These lines indicate the limit of liquid migration. The visible lines are dirt transported by the liquid, which is embedded deeply into the paper fibers.