Walnut oil From Wikipedia, the free encyclopedia. Walnut oil is oil extracted from walnuts. Walnut oil was one of the most important and vital oils used by Renaissance painters. Its quickness of drying and lack of yellow tint made and make this a good resource for thinning oil paint. Walnut oil has a fickle nature. In recent years, walnut oil has left the main art market after being found to become rancid when stocked at shops for too long. Though one will still find the mention of it in older references and occasionally a place of business may still sell it, it should be noted that its market is dying. Instead of walnut oil many artists and stores sell linseed oil, poppyseed oil, and safflower oil as replacements. On the other hand, walnut oil is favoured by some woodworkers as a finish for implements that will come in contact with food, such as cutting boards and wooden bowls.
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