Oakmoss Absolute Oil. This solvent is also known as Evernia Prunastri. It is made from light-green, lichen. This solvent is most commonly found in oak trees. but it can also be grown on many other species. It can be purchased in both concentrated and absolute form. It can also be used for fixing things. Oakmoss concrete is used most often in soaps. Many perfumes also contain oakmoss absolute.