We could add more pigment or filler, or we could get rid of some of that excess oil.
How do we remove the oil? By putting the mixture on blotting or absorbent paper and waiting. The paper will absorb the oil and a little of the pigment. Obviously to make it more runny we could add more oil and to dry faster and spread thinner we could add turpentine, thinners or petrol. Get the general idea!
One more thing - we can also add other things that are mixable with oil like certain resins and varnishes which will make the mixture sticky and shine and maybe dry in a layer like a clear plastic sheet. This might allow what is underneath to shine through. And when we add a little strong pigment to this sheet we can maybe make what is called a 'glaze'. Then again we could add some egg yolk for a 'matt' type finish.
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