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When you start an oil painting, the paint isn't shiny at first. The canvas ground sucks in some of the oil, and lean oil paint isn't very shiny anyway.
Most painters don't like this matte and raw appearance. Colors are different when they are matte (lighter).
Some painters then rub extra linseed oil into the dry paint, before they start to paint again over the first one or two layers. But I think it's better to use a non-fat varnish for that (like dammar varnish)
In oil painting, it's important to paint fat-over-lean. Each succeeding layer should be a little bit fatter than the layer before that. This is what makes your painting durable. And - oiling in a painting may disrupt this rule. When you put lean paint over fatter paint, it may start to chip off within a few years.
The Starry Night is an oil-on-canvas painting by Vincent van Gogh.
The painting is oil on canvas and measures 100 x 70 cm. The painting is oil on canvas and measures 100 x 70 cm.
It is an oil painting on canvas.
Oil on canvas
Oil on canvas
It is an oil painting on canvas.
The original painting, by Jeffrey Smart, is oil paint on canvas.
Oil on canvas.
A diptych.
Oil paint on canvas.
It is an oil painting on canvas.
It is an oil painting on canvas.