Robert Massey’s Canada balsam and sun thickened oil medium recipe resembles closely the legendary but no longer available, olio d’Abezzo.
Strasbourg Medium
Canada balsam, 4 parts, sun thickened linseed oil, 1 part, turpentine, 2 parts.
Combine and warm the ingredients either in hot sunshine or over a double boiler, and stir them until they mix completely. This is a very viscous, fragrant, water clear, medium. I make it on my deck using a double boiler. A few drops mixed right into the paint will speed drying and create a splendid enamel like surface.
Have any of you made and tried this medium?