Achieving a matte, non-reflective finish on bronze is a sought-after technique for artists, sculptors, and restorers. Here are the most common methods:

1. Chemical Patinas – Applying acidic solutions like ferric nitrate or liver of sulfur creates controlled oxidation, producing earthy, muted tones. Multiple layers can deepen the matte effect.

2. Abrasive Techniques – Sandblasting or hand-sanding with fine-grit paper (400+ grit) removes shine while preserving detail. Steel wool or wire brushing adds subtle texture.

3. Wax or Lacquer Sealing – After matte treatment, sealing with beeswax or matte lacquer protects the surface while maintaining low reflectivity.

4. Oxidation Accelerators – Ammonia fumes or vinegar-soaked cloths speed up natural tarnishing for an aged, dull appearance.

5. Powder Coatings – Specialty matte powder coatings provide durability and uniform non-reflective finishes for functional bronze items.

For best results, combine techniques—e.g., chemical patina followed by light abrasion—to customize the finish. Always test on scrap bronze first.