Intervention

Loose, non-greasy surface deposits were removed with soft-bristle brushes to avoid abrasion or mechanical stress on the original surface. More persistent residues were treated locally with specifically tested solvent gels, applied by brush to stains and incrustations for a selective and controlled action.

The old, degraded adhesives were removed using an ultrasonic vaporizer, which enabled the detachment of fragments without damaging the original material thanks to the gentle, non-invasive action of steam.

Although the terracotta showed no major structural issues, it underwent a surface consolidation treatment using 2% Paraloid B72 in MEK to stabilize the most vulnerable areas and prevent further deterioration.

For re-adhesion, smaller fragments were glued with 20% Paraloid B72 in MEK, while larger elements were assembled using a paste epoxy resin. Contact surfaces were pre-treated with Paraloid to improve adhesion and facilitate possible future disassembly. Original pins were reused when present; missing ones were replaced with fiberglass pins chosen for their mechanical and chemical compatibility.

Cracks and gaps were filled with Polyfilla, selected for its easy workability, chemical inertness, and reversibility. The fills were chromatically harmonized with natural pigments in respect of the original appearance.

Small portions of drapery and rock details were reconstructed using dental plaster mixed with terracotta powder, modelled according to the original forms and carefully applied to avoid overlapping authentic areas.

At the end of the intervention, a matte protective coating of reversible acrylic resin was applied to the entire surface, aimed at reducing moisture absorption and protecting the work from dust and atmospheric agents.