Bronze sculptures, especially unfinished ones, are prone to surface oxidation, which can lead to unwanted tarnishing and patina formation. To preserve their original appearance, several effective methods can be employed.

1. Wax Coatings: Applying a thin layer of microcrystalline wax creates a protective barrier against moisture and air, slowing oxidation. Regular reapplication ensures long-term protection.

2. Lacquer Sealants: Clear lacquers, such as acrylic or polyurethane, provide a durable shield. Choose UV-resistant options to prevent yellowing over time.

3. Environmental Control: Store sculptures in low-humidity environments (below 50% RH) and avoid direct sunlight or pollutants. Use silica gel packs in display cases.

4. Inhibitor Sprays: Commercial anti-tarnish sprays chemically delay oxidation. Test on a small area first to ensure compatibility.

5. Regular Cleaning: Gently dust with a soft brush to remove contaminants that accelerate oxidation. Avoid abrasive materials.

For unfinished bronze, wax or lacquer is often preferred for their non-invasive nature. Combining these methods with proper storage ensures lasting preservation. Always monitor the sculpture’s condition and reapply treatments as needed.