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Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus

Bivariate plot of daily minimum (RHmin) and maximum (Tmax) relative humidities in 2010 vs. 2008. Bivariate plot of RHmin (a) and RHmax (b) recorded from each probe in 2010 vs. 2008 (14th to 31st of August). The tilted line is the bisector.
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Figure 10: Bivariate plot of daily minimum (RHmin) and maximum (Tmax) relative humidities in 2010 vs. 2008. Bivariate plot of RHmin (a) and RHmax (b) recorded from each probe in 2010 vs. 2008 (14th to 31st of August). The tilted line is the bisector.

Mentions: RH and temperatures measured during one day by a given probe were negatively correlated according to Figure 3 because the maximum temperatures recorded at midday correspond to the minimum RH. Moreover, probes that yielded the highest temperatures (Tmax) also recorded the lowest RH (RHmin), which was also reported in the previous study[24]. This inverse relationship between Tmax and RHmin shows up by comparing Figures 9a and10a because the relative position of probes in both figures is basically the same. There is also certain similarity between Tmin (Figure 9b) and RHmax (Figure 10b).


Evaluation of corrective measures implemented for the preventive conservation of fresco paintings in Ariadne's house (Pompeii, Italy).

Merello P, García-Diego FJ, Zarzo M - Chem Cent J (2013)

Bivariate plot of daily minimum (RHmin) and maximum (Tmax) relative humidities in 2010 vs. 2008. Bivariate plot of RHmin (a) and RHmax (b) recorded from each probe in 2010 vs. 2008 (14th to 31st of August). The tilted line is the bisector.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3672094&req=5

Figure 10: Bivariate plot of daily minimum (RHmin) and maximum (Tmax) relative humidities in 2010 vs. 2008. Bivariate plot of RHmin (a) and RHmax (b) recorded from each probe in 2010 vs. 2008 (14th to 31st of August). The tilted line is the bisector.
Mentions: RH and temperatures measured during one day by a given probe were negatively correlated according to Figure 3 because the maximum temperatures recorded at midday correspond to the minimum RH. Moreover, probes that yielded the highest temperatures (Tmax) also recorded the lowest RH (RHmin), which was also reported in the previous study[24]. This inverse relationship between Tmax and RHmin shows up by comparing Figures 9a and10a because the relative position of probes in both figures is basically the same. There is also certain similarity between Tmin (Figure 9b) and RHmax (Figure 10b).

Bottom Line: Data recorded in 2008 and 2010 were compared.As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings.In the room with four walls, the daily fluctuations also decreased about 4°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Physics (UD Agriculture Engineering), Universitat Politècnica de València, Camino de Vera s/n, Valencia, 46022, Spain. fjgarcid@upvnet.upv.es.

ABSTRACT

Background: A microclimate monitoring study was conducted in 2008 aimed at assessing the conservation risks affecting the valuable wall paintings decorating Ariadne's House (Pompeii, Italy). It was found that thermohygrometric conditions were very unfavorable for the conservation of frescoes. As a result, it was decided to implement corrective measures, and the transparent polycarbonate sheets covering three rooms (one of them delimited by four walls and the others composed of three walls) were replaced by opaque roofs. In order to examine the effectiveness of this measure, the same monitoring system comprised by 26 thermohygrometric probes was installed again in summer 2010. Data recorded in 2008 and 2010 were compared.

Results: Microclimate conditions were also monitored in a control room with the same roof in both years. The average temperature in this room was lower in 2010, and it was decided to consider a time frame of 18 summer days with the same mean temperature in both years. In the rooms with three walls, the statistical analysis revealed that the diurnal maximum temperature decreased about 3.5°C due to the roof change, and the minimum temperature increased 0.5°C. As a result, the daily thermohygrometric variations resulted less pronounced in 2010, with a reduction of approximately 4°C, which is favorable for the preservation of mural paintings. In the room with four walls, the daily fluctuations also decreased about 4°C. Based on the results, other alternative actions are discussed aimed at improving the conservation conditions of wall paintings.

Conclusions: The roof change has reduced the most unfavorable thermohygrometric conditions affecting the mural paintings, but additional actions should be adopted for a long term preservation of Pompeian frescoes.

No MeSH data available.


Related in: MedlinePlus