Advantages of using microbial technology over traditional chemical technology in removal of black crusts from stone surfaces of historical monuments

This study compares two cleaning methods, one involving an ammonium carbonate-EDTA mixture and the other involving the sulfate-reducing bacterium Desulfovibrio vulgaris subsp. vulgaris ATCC 29579, for the removal of black crust (containing gypsum) on marble of the Milan Cathedral (Italy). In contrast to the chemical cleaning method, the biological procedure resulted in more homogeneous removal of the surface deposits and preserved the patina noble under the black crust. Whereas both of the treatments converted gypsum to calcite, allowing consolidation, the chemical treatment also formed undesirable sodium sulfate.



Digital Object Identifier (DOI): http://dx.doi.org/10.1128/AEM.00394-07
Codice identificativo ISI: WOS:000249246700039
Codice identificativo Scopus: 2-s2.0-34548509892
Handle: http://hdl.handle.net/11695/3283
Abstract: This study compares two cleaning methods, one involving an ammonium carbonate-EDTA mixture and the other involving the sulfate-reducing bacterium Desulfovibrio vulgaris subsp. vulgaris ATCC 29579, for the removal of black crust (containing gypsum) on marble of the Milan Cathedral (Italy). In contrast to the chemical cleaning method, the biological procedure resulted in more homogeneous removal of the surface deposits and preserved the patina noble under the black crust. Whereas both of the treatments converted gypsum to calcite, allowing consolidation, the chemical treatment also formed undesirable sodium sulfate.
Titolo: Advantages of using microbial technology over traditional chemical technology in removal of black crusts from stone surfaces of historical monuments
Autori: 
RANALLI, Giancarlo  
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