Painting I / Oil, Fat Media and the Rule of Fat Over Lean
Practice question · Put in order

Arrange these layers of an oil painting in order from the leanest to the fattest, as the rule requires them to be applied.

Hints
  1. The leanest layer is the one thinned with solvent and nothing else.
  2. The glaze carries more medium than anything under it.
Show the answer
  1. A thin imprimatura wiped out with solvent
  2. A monochrome underpainting with very little added oil
  3. The first opaque colour layers, with a small amount of medium
  4. Later modelling layers with proportionally more oil
  5. Final glazes carrying the most medium of all
Why

The order is also a timetable, because leaner layers dry sooner. That is the practical benefit hidden inside the structural rule: working lean to fat means each layer is touch-dry before the next arrives, so the sequence protects the film and the working method at the same time.

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