Synergic use of ammonium oxalate and di-ammonium phosphate in the protection and consolidation of carbonate materials

The aim of this this research is to verify the suitability of some treatments based on ammonium oxalate and ammonium phosphate for the consolidation and protection of the internal entrance of Palazzo Verita Montanari (1583) in Verona, made of Avesa Stone. Different application protocols of the two products have been compared (the product alone, in mutual sequence, in mixture). The efficacy and limitations of the treatments are discussed on the basis of the results obtained with various types of diagnostic analyzes, invasive and non-invasive, as part of a laboratory experimentation carried out on specimens of the same carbonate stone.