If 'lean' is coloured over 'fat', it will dry first,Abstract Paintings making the 'lean' part of colour susceptible to shrinkage (shrinking) and breaking when the 'fat' part gets dry beneath it. Lower levels also usually absord oil from the levels above them.Therefore every part in an oil painting should be a little 'fatter' than the past one, or have a higher percentage of oil in it. Famous Oil PaintingsThe dehydrating periods of artists quality oil shows will differ because they are usually made only from color and oil; less expensive shows may have dehydrating providers included to make the dehydrating periods more reliable.