Hello, the main oil used is linseed oil. It has great drying capacities. But it goes yellow in time (only when put in the dark!). It goes clear again in the light. Still, for blues and white, poppy-...
Of course! Olive oil is the traditional salad oil in olive-producing countries, but sunflower oil, canola oil, safflower oil, corn oil, walnut oil, or plain old "vegetable" oil all work and they all...