I needed (for my art's sake) to find a way to wash my brushes less often. I came across a group of artist that rarely washed their brushes and instead coat them in oil to prevent them from drying out between painting sessions. For that I needed a slow drying oil. So I did some research and settled on walnut oil.
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Removes color from artists brushes without creating a solvent hazard The addition of walnut oil to color will increase flow and slow the drying
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