Sun-Thickened Walnut Oil 8 fl oz

Rublev Colours Sun-Thickened Walnut Oil is made by exposing filtered, cold-pressed walnut oil to sunlight in shallow tanks covered with clear glass and exposed to the atmosphere for a period of three months. No driers or other additives are used in the making of this oil. The exposure to sunlight thickens it. This walnut oil is naturally bleached to almost water white, so it can be used with palest colors and whites. This oil can be used as a medium or added to homemade mediums.

Use turpentine or mineral spirits as a solvent or diluent for oil painting mediums made with walnut oil. Our walnut oil is a drying oil derived from California walnuts.

As early as the fifth century walnut oil was recommended by Aetius for varnishing wax pictures and gilt surfaces. It is recommended for all light pigments in the treatises on painting by Leonardo da Vinci, Vasari, Borghini, Lornazzo, Armenini, Bisagno, Volpato, and others.

Acid Value (mg KOH/g), max: 1
Color (Gardner 1953), max.: 2
Viscosity (Stokes @ 25° C): 0.65
Viscosity (Gardner-Holdt @ 25° C): B
Saponification Value: 162-172
Appearance: Clear/Transparent at 25° C
Weight Per Gallon: 7.81 lbs.

Must be stored in a cool, dry place away from direct light.

Warning: Rags or paper towels contaminated with vegetable drying oils, particularly those containing iron oxide pigments are susceptible to spontaneous combustion. To prevent unexpected fires, used rags or paper towels contaminated with oil-based materials should be collected in a closeable, air-tight container. Store water-dampened rags or paper towels in a metal container with an air-tight top. Alternately, washing contaminated rags will remove contaminating materials and eliminate risk.