Cupping

From Wiki
Raking light image of painting showing cupping

Cupping is a distortion of the paint surface on canvas resulting in concave sections of paint and raised areas of paint adjacent to cracks (Kirsh and Levenson 2000).

Aged paint, loosened by cracking, with edges curling to create cup-like formations; courtesy of Fine Arts Conservancy Stoneledge, LLC

Related Terms

Crackle, Cleavage, Craquelure, Flaking

Translation

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Discussion

Crackle patterns on surfaces of paintings can sometimes form islands of paint that can lead to cupping (Canadian Conservation Institute 2011). The cracks in the paint layers allow for air and environmental factors to penetrate in between and under the paint layers. As a result of fluctuations in temperature and relative humidity, paint may delaminate, curling away from the surface along the cracks, forming a concave center with raised edges, like a cup or crater (Michalski 2014). Prolonged cupping can lead to the the distortion of the fabric support of the painting due to tension (South Florida Art Conservation 2013).

Reference

Condition Reporting - Paintings. Part III: Glossary of Terms - CCI Notes 10/11. 2011. Canadian Conservation Institute. Retrieved 3/24/2014. http://www.cci-icc.gc.ca/publications/notes/10-11-eng.aspx

Kirsch, Andrea and R.S. Levenson. 2000. Seeing Through Paintings: Physical Examinationin Art Historical Studies. New Haven: Yale University Press.

Michalski, Stefan. "Agents of Deterioration: Incorrect Relative Humidity." Last modified March 13, 2014. http://www.cci-icc.gc.ca/caringfor-prendresoindes/articles/10agents/chap10-eng.aspx

South Florida Art Conservation. "Craquelure." August 19, 2013. http://www.sflac.net/blog/tag/craquelure/