What technique did mural painters usually use for preliminary drawings of outlines and details?

Name: What technique did mural painters usually use for preliminary drawings of outlines and details?
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Buon fresco, which involves applying pigment mixed with water on a thin layer of wet, fresh lime mortar or plaster, was commonly used for preliminary sketches in mural painting. This technique allowed the colors to merge with the wall, ensuring the durability of the mural.

What Technique Did Mural Painters Usually Use for Preliminary Drawings