<p><strong>Roiro-zumi</strong> is a traditional Japanese polishing charcoal, used to achieve the ultimate <strong>Roiro-nuri</strong> finish: a deep, glossy black mirror surface, called <em>roiro</em> (“shiny black”).</p><p><br> Made from dense woods such as Japanese oak, this extremely fine charcoal is used with <strong>camellia oil</strong> , ensuring a delicate polish without scratches. It is used as the final step, after <strong>Suruga-zumi</strong> (flattening) and <strong>Hōh-zumi</strong> (soft finishing).<br><br> Essential for the refined techniques of <strong>Kintsugi</strong> and <strong>Maki-e</strong> , Roiro-zumi gives your creations an intense shine and unparalleled brilliance.</p>