Turner Painting Medium Based on Dammar gum (natural resin). May be mixed with oil colors in all proportions, particularly suited for work with fresh paints. Reinforces the cohesion of the brushstroke and accentuates gloss. Useful for glazing and transparent washes. Thinners: mineral spirits and turpentine. It is a ready-to-use medium that can be used throughout the production of a painting.