10 years of marble conservation by ammonium phosphate: laboratory and field data on protection, consolidation and mitigation of bowing

This paper presents a brief review of the use of ammonium phosphate solutions for the conservation of marble artworks. First, the idea behind the treatment is presented and the studies aimed at optimizing the treatment parameters are summarized. Then, the treatment ability to protect marble from dissolution in rain, to consolidate weathered marble and to mitigate bowing are reviewed. Finally, some field studies are presented.