Sun thickened walnut oil is exposed to the sun for about 90 days, causing it to oxidize, polymerize, thicken and lighten. It dries faster than conventional walnut oil and has a drying effect when applied as a medium, giving the color more shine.
Sun thickened oils are particularly suitable for glazes in the upper layers of paintings. It is ideal as a medium for glazes. Oil paints that are produced or mixed with walnut oil have a slightly shorter or more buttery character than linseed oil.
Please note the "fat over lean" rule.
Caution: In case of pure use by means of cloths, self-ignition is possible.
Do not store contaminated rags open, but discard or store in fireproof containers.