tung oil

a drying oil derived from the seeds of the Chinese tung tree that is commonly used as a wood finish and to protect other materials

Tung oil is a natural oil extracted from the seeds of the tung tree. It is used as a finish for wood to improve its appearance and protect it from moisture and damage. Tung oil dries to a hard, water-resistant coating that emphasizes the natural beauty of the wood, providing a durable and long-lasting finish. It is often used in furniture, cabinets, and other woodwork.