Degradation of lead-based pigments by salt solutions

0340400 - ÚACH 2010 RIV FR eng J - Journal Article
Kotulanová, Eva - Bezdička, Petr - Hradil, David - Hradilová, J. - Švarcová, Silvie - Grygar, Tomáš
Degradation of lead-based pigments by salt solutions.
Journal of Cultural Heritage. Roč. 10, č. 3 (2009), s. 367-378. ISSN 1296-2074. E-ISSN 1778-3674
R&D Projects: GA ČR(CZ) GA203/07/1324; GA AV ČR KJB400320602
Institutional research plan: CEZ:AV0Z40320502
Keywords : X-ray microdiffraction * salts * red lead
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.505, year: 2009

Interactions of lead-based pigments with a number of inorganic salts, one of the most dangerous degradation agents of wall paintings, were studied under laboratory conditions. The results were used to interpret colour changes observed in 11th century frescoes from the church of Saint George in Kostol'any pod Tribecom, the oldest preserved wall paintings in Slovakia. Interactions of selected pigments (lead white, massicot, red lead) with different salt solutions were performed within long-term laboratory experiments. We used a selection of naturally occurring salts (Na2SO4, MgSO4, CaSO4, NaCl, NaNO3, Ca(NO3)(2), Na2CO3, K2CO3 and urea) and, additionally, a range of synthetic salts that are often applied to the wall paintings during their cleaning and conservation (NaHCO3, KHCO3, (NH4)(2)CO3, NH4HCO3).
Permanent Link: http://hdl.handle.net/11104/0183647