Which natural resin is known for being cooked with vegetable oils to create a quick-drying coating?

The natural resin recognized for being cooked with vegetable oils to produce a quick-drying coating is copal. This resin enhances the drying properties of the oil-based paint and contributes to a durable finish. Copal itself is derived from the tree resin of various species, particularly from tropical trees, and is utilized in artistic mediums and varnishes because of its ability to form a tough, glossy finish.

Rosin and lac, while also natural resins, do not undergo this specific cooking process with vegetable oils for quick-drying applications. Rosin is typically used in applications such as inks and adhesives, while lac is primarily known for its use in shellac varnishes. Shellac, on the other hand, is derived from the lac bug and is often used as a finish but is not primarily combined with vegetable oils in the same way that copal is for quick-drying effects. Thus, copal stands out as the correct answer in this context regarding its unique ability to be used in combination with oils for rapid drying properties in coatings.