American black walnut white woody milky white, heartwood was brown to brown black, often with a purple crack and darker stripes. Walnut is usually straight wood, sometimes with corrugated or curved grain, producing attractive, decorative graphics. Walnut is a medium-density tough hardwood, bending strength and rupture strength is moderate, low rigidity, good steam bending performance. Walnut easy to use hand tools and machining, nails, screws and glue fixed performance, with excellent paint and dye retention, polishing can get a particularly good surface. Walnut dry and slow, need to be careful care to avoid the occurrence of drying aging. Walnut has a good dimensional stability, was assessed as the core material corrosion resistance of wood. Its white wood will be eroded by the beetles.