This is a beautiful California Black Walnut bowl—sometimes called Claro Walnut. It has light colored highlights and amazing grain patterns. It may be used to serve salads, chips, crackers, and other such items. A walnut oil finish was used to help protect the wood's character. The bowl may be cleaned with warm water and mild detergent. Wipe dry immediately. It can be re-oiled with walnut oil (found in grocery stores) or mineral oil. Do not use vegetable oils as they turn rancid in time. The Black Walnut tree was taken down in Alamo, California by a homeowner in July 2009.