Fat over lean refers to the principle in oil painting of applying paint with a higher oil to pigment ratio ('fat') over paint with a lower oil to pigment ratio ('lean') to ensure a stable paint film, since it is believed that the paint with the higher oil content remains more flexible. Oil paint dries at different rates due to the differing drying properties of the constituent pigment.
Fat over lean refers to the principle in oil painting of applying paint with a higher oil to pigment ratio ('fat') over paint with a lower oil to pigment ratio ('lean') to ensure a stable paint film, since it is believed that the paint with the higher oil content remains more flexible. Oil paint dries at different rates due to the differing drying properties of the constituent pigment.
Source: Wikipedia "Fat over lean" · CC BY-SA 4.0
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