Use walnut oil instead of linseed for any pale colour where yellowing would shift the hue over time. Titanium white, pale blues, and light flesh tones all benefit.

Loosening paint: Add a small drop to stiff paint on the palette to increase flow. The near-colourless quality means it will not shift any colour, however pale.

Solvent-free working: Walnut oil can be used as a brush cleaner between colours during a painting session — particularly useful for artists who prefer a solvent-free studio environment. Note: paint does not settle cleanly to the bottom of the jar as with OMS, making it more wasteful for brush cleaning.

Combination with OMS: Mix walnut oil with a small amount of OMS to balance the slow drying time while maintaining low toxicity.