Yes, you can use walnut oil with water-mixable oil paints.
Walnut oil can be used as a medium with water-mixable oil paints, similar to how it's used with traditional oil paints. However, it's important to be aware of a few factors:
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Drying Time: Walnut oil generally dries slower than linseed oil. Adding it to water-mixable oils will likely extend the drying time of your painting. This isn't inherently bad, but it requires planning, especially if you intend to layer paint.
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Mixing Ratios: Experiment with different ratios of walnut oil to water-mixable oil paint to achieve your desired consistency and drying time. Start with small amounts and gradually increase as needed.
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Water Miscibility: While walnut oil is oil, it's still compatible with the water-mixable nature of the paints. You can still use water to thin your paints and clean your brushes.
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Potential Benefits: Some artists prefer walnut oil for its non-yellowing properties compared to linseed oil, which can yellow slightly over time. It can also provide a smoother, more fluid consistency to the paint.
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Consider the specific purpose. Are you using it to increase transparency, flow, or gloss? Understanding your goal will help you determine the optimal amount to use.
In summary, walnut oil is a viable option as a medium with water-mixable oil paints, offering benefits like a non-yellowing finish and smooth consistency. Just be mindful of the extended drying time.
