Old Bavarian Medium, 0.5 oz. Old Bavarian Medium was developed in Germany in the 19th century. It is a proprietary formula that is a mixture of Balsam Copaiba Oil and other ingredients. It is a slower drying medium than Balsam Copaiba Oil alone and allows a very smooth application of color. It was the medium of choice for many of the "old masters" of German china painting in the late 1800's and early 1900's. California residents see Prop 65 Warnings