This is a brilliant, modern innovation of oil painting mediums. It's a superior quality alkyd resin that dries approximately twice as quickly as traditional oil painting mediums.
The speed of drying is achieved by the addition of polyester resin and a catalyst dryer. The base oil is typically from soybeans. The solvent is turpentine, derived from the sap of the pine tree. There is very little yellowing from tests of its lightfastness so it's overall a excellent painting medium.