Oil painting in the composition of the use of dry oil, dry oil is to refer to can be completely dry or volatile oil, such as linseed oil, walnut oil, poppy oil and so on. And soybean oil is not a kind of dry oil, of course, it can dilute the oil painting color, but he will not be dry in the oil painting color, and will be moldy, so do not use. Even if its better to use gasoline than him, although gasoline can be the color becomes very gray.