Hard to come by this, and very useful, really can't recommend this enough.
Lavender spike oil is a natural, low-toxic substitute for turpentine. It can be used as a solvent for oil painting and in egg-oil emulsion tempera recipes. Spike oil improves the handling of oil-based paints, because it promotes oxidation instead of simply evaporating like most solvents. A small amount goes a long way and it has a pleasant smell unlike other solvents. It evaporates slower than turpentine, mineral spirits (white spirits) and odorless mineral spirits (OMS).
This spike oil is imported from Spain where it is extracted from spike lavender plant (Lavandula latifolia) and steam distilled to high purity.