Page "Walnut oil" Paragraph 6

Commercially, walnut oil has become hard to find ; demand often is low, and stock readily becomes rancid if stored in transparent, warm or ventilated containers.

Instead of walnut oil, many artists and stores sell linseed oil, poppyseed oil, and safflower oil as replacements.

Recently, the problem of rancidity has been solved with the introduction of commercial alkali refined walnut oil paints and media.