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Czynniki powodujące niszczenie fresków w średniowiecznym kościele na Malcie

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Taliana C., Cassar J., Vella A. J., Ventura F.
Ochrona Zabytków
|
1995
|
issue 1
85-90
EN
The fifteenth-century Church of the Annunciation at Hal Millieri hosts a series of frescoes which are unique to Malta. Concern for the conservation of these frescoes prompted a long-term study which included monitoring the internal microclimate of the church and a chemical and mineralogical analysis of samples taken from its fabric. Salts, mainly sodium chloride and nitrate, were found in the lower courses of the limestione walls. Erratic fluctuations in the relative humidity inside the church occasioned crystallisation of these soluble salts with damaging effects on the frescoe. Sealing off small windows in the little-used church caused the relative humidity to stabilize above 75%. This simple measure has eliminated the dissolution/crystallisation cycles and proved to be sufficient in resolving the problem of deterioration.
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