St Romuald (detail of Crucifixion)

surface prep

While the specific ground for this oil work is not detailed in the sources, traditional oil painting techniques often begin with a prepared surface. Given the Early Renaissance context and the shift from tempera to oil, the surface was likely a wood panel or canvas prepared with gesso or a similar ground to accept the oil medium. The artist must ensure the surface is stable to prevent cracking, as the quality of the oil and layering determines the strength of the paint film (Source 1).

underdrawing

The artist should sketch the subject onto the surface using charcoal or thinned paint, as this is a traditional starting point for oil painting (Source 1). Fra Angelico’s academic drawings were highly finished to acquire a habit of minute visual expression, ensuring that smaller subtleties of drawing became instinctive, allowing the mind to focus on bigger qualities during the painting process (Source 7).

underpainting

The process likely involves a monochrome preparation, such as a grisaille, which is then glazed and scumbled with oil. This method, practiced by old masters, involves extracting red and yellow colors initially and translating what would be left in nature, before adding transparent coats of color (glazing) and semi-opaque layers (scumbling) to build tone and depth (Source 4).

Fat over Lean

A basic rule of oil paint application where each additional layer contains more oil than the layer below to allow proper drying and prevent cracking (Source 1).

Glazing and Scumbling

Glazing applies transparent coats of color; scumbling applies semi-opaque layers. This method was practiced by old masters to build color and tone over a monochrome underpainting (Source 4).

Minute Visual Expression

Creating highly finished academic drawings to develop an instinctive sense of detail, allowing the artist to focus on emotional significance during painting (Source 7).