Hello, 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...
If the paint is made of linseed oil (most oil paints are), the paint will go yellow in the dark. But it's not really bad - if it's put back in the daylight, it will go clear again, even if the paint...