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YELLOWING (CHROMATIC CHANGE)
YELLOWING (CHROMATIC CHANGE)

Sample

Paper Booklet. "Geometrical drawing guide". Luis Bru y G. de Herrero. 1942, Madrid. University of Barcelona. Spain

Pathology Causes

Hydrolysis, (photo) oxidation and acidification have generated chemical transformations increasing cellulose degradation and making the document very brittle.


Visual Image

Author: Ana Martín Rivero
Description: Yellowing of Paper Booklet. Small spots are observed on the surface and material losses on the corners because the document is more fragile.

Image detail / macro

YELLOWING (CHROMATIC CHANGE)
YELLOWING (CHROMATIC CHANGE)
Author: Ana Martín Rivero
Magnification: x25 - x10
Description: Yellowing and separation of fibers.

Associated Pathologies

Brittle surface.
Breakage.
Loss of support.

Other Tests

Acidity Measurement: pH 3.86

Observations

File author: Ana Martín Rivero.

Subject: Examen, Diagnóstico y Documentación II.



Bibliography

TACÓN CLAVAIN, J. La conservación del libro antiguo. Documentos de trabajo U.C.M.  Biblioteca Histórica, 2004 (2). pp. 1-14.

 

ODOR CHAVEZ, A. Mecanismos químicos de la transformación del papel. In: http://www.agcrchile.cl/wp-content/uploads/2011/09/Mecanismos-qu%C3%ADmicos-de-la-transformaci%C3%B3n-del-papel.pdf


MAY, E.; Jones, M. Conservation science: heritage materials. Cambridge: RSC Pub. cop. 2006.


Author

Secció Conservació-Restauració. Facultat Belles Arts. ub.conservacio.restauracio@gmail.com

Education


Institution or Company

Universitat de Barcelona


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