Scanning Microscopy Techniques as an Assessment Tool of Materials and Interventions for the Protection of Built Cultural Heritage

(a) Digital microscopy image of black crust after cleaning, using ion-exchange resin with deionized water for 20 min, capital, National Archaeological Museum of Athens, Greece (×25); (b) SEM BSE image of the under examination cleaned surface; (c, d, e) EDX mapping of the detected elements, Ca, Ba, and S, respectively.