Non-drying oil
Oil which remains liquid on exposure to air / From Wikipedia, the free encyclopedia
A non-drying oil is an oil which does not harden and remains liquid when it is exposed to air. This is as opposed to a drying oil, which hardens (through polymerization) completely, or a semi-drying oil, which partially hardens. Oils with an iodine number of less than 115 are considered non-drying.