C 6.20. Rigidity, stiffness
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
The parchment is rigid or stiff when the material has lost its initial flexibility and elasticity.

Jäik.
Materjal on kaotanud oma esialgse painduvuse.
Dokumente hoiti ja käsitleti enamikel juhtudel kokku voldituna. Pärgamendil on selgelt eristatavad murdejooned ja kokkuvoltimisele iseloomulik pärgamentlehe deformatsioon. Jäikade pärgamentide puhul on pärgament sageli deformeerunud murdejoonte piirkonnas. br>
Stiff.
The material has lost its original flexibility.
Documents were stored and handled in most cases folded. The parchment has clearly distinguishable fold lines and the characteristic deformation of the parchment sheet when folded. In stiff parchments, the parchment is often deformed in the area of the fold lines.

Ürik AM.104.5.14, 18. saj.
Jäik.
Materjal on kaotanud oma esialgse painduvuse.
Jäigaks muutunud pärgament on kaotanud oma painduvuse, on deformeerunud ning kaotanud oma esialgse kuju. br>
The material has lost its original flexibility.
The stiffened parchment has lost its flexibility, is deformed and has lost its original shape.

Jäik.
Pärgamendilehe mahuline kahanemine köites pärgamendi degradeerumise tulemusena.
Materjal on kaotanud oma esialgse painduvuse ja muutunud jäigaks. br>
Shrinkage of a parchment sheet in binding as a result of parchment degradation.
The material has lost its original flexibility and become rigid.

Jäik.
Materjal on kaotanud oma esialgse painduvuse.
Materjali kokkutõmbumise tagajärjel deformeerunud pärgamentdokument. br>
The material has lost its original flexibility.
A parchment document deformed as a result of material shrinkage.

Ürik AM.115.3.17, 1749. a.
Jäik.
Pärgamendil on hästi näha lehe deformatsioon, pärgamendi kokkutõmbumine, mille üheks põhustajaks võivad olla veresoontesse jäänud verejäägid (veres sisalduvad rauasoolad). Verejääkide toimel on pärgament degradeerunud ja muutunud jäigaks. br>
The deformation of the sheet, the shrinking of the parchment can be clearly seen on the parchment, one of the causes of which can be blood residues left in the blood vessels (iron salts contained in the blood). Due to the residual blood, the parchment has degraded and become stiff.