The 'recipe' of the stucco sculptures of Giacomo Serpotta

Mineralogical and chemical data (organic) of some representative samples collected from stucco-works by the famous Sicilian sculptor Giacomo Serpotta (Palermo, 1656-1732) have been combined with the aim of ascertaining their manufacture technology in the light of local historical sources. A complete correspondence between samples belonging to the 'Victory' statue (1723) and the SS Rosario oratory (1685-1689) as regards stratigraphy, mineralogy of sand aggregate, composition of binder matrix, and nature and concentrations of organic additives is pointed out. Considering that the studied works of art cover more than 35 years of the artist's activity, it is consequential to think of a well-established 'recipe'. A significant spin-off should be derived in the comprehension of deterioration processes and correct design of restoration works.