C6 damage sub-categories:
C 6.1. Rust accretion, foxing
C 6.2. Glass-like layers
C 6.3. Stains, accretion
C 6.3.1. Handling marks
C 6.3.2. Ink stains
C 6.4. Ink corrosion
C 6.5. Ink loss; fading
C 6.6. Offset
C 6.7. Ink flake off; detachment of the parchment
C 6.8. Tears, splits
C 6.9. Pleats
C 6.10. Cockling
C 6.11. Curling
C 6.12. Pleats, double folds
C 6.13. Folds
C 6.14. Contraction, shrinkage
C 6.15. Internal loss
C 6.16. Edge loss
C 6.17. Blooms; calcite deposits
C 6.18. Micro-biological damage, mould, grazing
C 6.19. Brittleness
C 6.20. Rigidity, stiffness
A localised, discoloured area on the parchment, a deposit of foreign matter on the surface. Stains cannot be removed using a dry method.