Gold alloy tsuba used in decorative tanto fittings are typically cast or machined from zinc or brass alloy with a gold-tone plating or patina applied over the surface. The finish is durable under normal display conditions but can dull from contact with skin oils, moisture, or abrasive cleaning materials. After handling, wipe the tsuba gently with a clean, dry microfiber cloth - avoid paper towels, which can leave micro-scratches. Do not use metal polish or chemical cleaners, as these can strip the plating unevenly. If the tsuba develops light tarnish over time, a very light application of Renaissance Wax or similar museum-grade paste wax, buffed to a shine with a soft cloth, helps protect and restore the surface without aggressive chemical action.