Red lacquer saya are beautiful but need a few simple precautions to stay that way over years of display. First, keep the piece out of prolonged direct sunlight - UV exposure causes lacquer pigments to fade and can cause the underlying wood to warp or crack along the grain. A display away from south-facing windows or behind UV-filtering glass is ideal. Humidity is the other key variable: lacquer over wood can develop hairline cracks if indoor air becomes very dry, so a small room humidifier in winter months goes a long way. For cleaning, a soft dry cloth is all that's needed for dust; avoid water or solvent-based cleaners, which can dull or lift the finish. If the saya has decorative engraving or inlaid elements, use a soft brush - like a clean watercolor brush - to clear dust from recessed areas without scratching the surface.