plate no. 5442

Detail of St. Catherine from Virgin and Child with Saints, the Altarpiece of San Barnabas

panel, temperaEarly Renaissancereligious paintingportraitfigurereligioussaintheadscarf

recreation guide

This recreation focuses on the tempera panel technique characteristic of Sandro Botticelli’s Early Renaissance period. The artwork, a detail from the Altarpiece of San Barnabas, relies on the fast-drying, water-soluble binder medium known as egg tempera, which consists of pigments mixed with glutinous material such as egg yolk (Source 5). Unlike oil painting, which allows for blending and illusionistic depth, tempera demands a methodical application of distinct, linear strokes to build up color and form. The artist’s practice during this era prioritized the 'vitality possessed by the medium' over deceptive naturalism, treating the painted surface as a collection of symbols rather than a window into reality (Source 6). The palette would have been grounded in substantial, fixed earths, ochres, and marls, which offer covering power and ease of drying, alongside traditional pigments like chalk white, red ochre, and black (Source 1).

estimated time

40-60 hours over 8-12 sessions

materials

8 items

steps

5 in sequence

materials

item	purpose	modern equivalent
Egg yolk	Primary binder for the tempera medium	—
Gesso ground (chalk/gypsum and animal glue)	Preparation of the wooden panel surface	Acrylic gesso (though traditional rabbit-skin glue and chalk is historically accurate)
Natural and burnt ochres	Earth tones for modeling and broken tones	Yellow Ochre, Burnt Sienna
Chalk white / White lead	Highlights and mixing base	Titanium White (for safety) or Flake White (for historical accuracy)
Red ochre / Cinnabar (Vermilion)	Flesh tones and red garments	Red Ochre, Cadmium Red or Vermilion
Indigo / Blue enamels	Blue garments and shadows	Ultramarine or Indigo pigment
Various blacks (ivory black, grapestone black)	Outlines and deep shadows	Ivory Black or Mars Black
Sable or squirrel hair brushes	Fine linear application of tempera	Fine liner brushes

preparation

surface prep

The panel must be prepared with a smooth, white gesso ground. While specific preparation details for this exact panel are not in the sources, Early Renaissance tempera requires a rigid, absorbent surface. The artist must ensure the ground is perfectly smooth to allow for the fine linear work characteristic of the period. The material choice is critical; as noted, the artist must find out the particular qualities of the medium and not attempt more than it is capable of doing (Source 6).

underdrawing

Botticelli’s drawings are well-documented (Source 8), suggesting a strong reliance on preparatory sketches. For tempera, a carbon transfer or a light underdrawing in charcoal or black chalk is likely used to establish the linear composition. The underdrawing should be precise, as tempera does not allow for the 'departure from outline' that oil painting might permit (Source 2).

underpainting

In tempera, there is no true 'underpainting' in the oil sense (like grisaille). Instead, the artist likely begins with the darkest tones or a mid-tone ground, building up light through glazing and scumbling. However, given the 'fast-drying' nature of the medium, the process is additive from dark to light or light to dark depending on the specific pigment opacity. Sources do not specify a distinct underpainting layer for this work, so the artist should proceed directly to color application in thin layers (Source 5).

color palette

White

Chalk white or White lead

Highlights and mixing base; ancient artists used chalk white (Source 1)

Yellow/Earth

Natural and burnt ochres

Broken tones, skin modeling, and earthy backgrounds; valued for fixedness and covering well (Source 1)

Red

Red ochre, Cinnabar (Vermilion), or Red lac

Garments and flesh tones; Pliny notes the enrichment of painting with new colorants like red lac and cinnabar (Source 1)

Blue

Indigo or Blue pulverised enamels

Virgin’s robes or saintly garments; listed as available coloring substances (Source 1)

Black

Ivory black or grapestone black

Outlines and deep shadows; prepared from combustion of different bodies (Source 1)

composition

The composition likely adheres to the rectangular format, where vertical and horizontal lines set up a relationship with the boundaries of the picture (Source 7). The artist should be mindful of the 'arresting power of the right angle' at the corners, potentially using dark masses or swinging lines to direct the eye to the center (Source 7). While specific details of St. Catherine’s pose are not described in the sources, the general principle of arranging abstract lines to create rhythmic force applies (Source 7). The work is part of a larger altarpiece, which may have included donor portraits or other saints, reflecting the religious devotion of the period (Source 4).

step by step

underdrawing→first pass→refining→finishing

underdrawing

step 01
Transfer the design onto the gessoed panel using charcoal or black chalk. Ensure lines are precise, as tempera requires a firm outline.
Tip — Do not over-model at this stage; keep it structural.
Linear drawing

first pass

step 02
Mix pigments with egg yolk and a small amount of water. Apply the first layer of color in thin, transparent washes or opaque strokes, depending on the pigment.
Tip — Tempera is fast-drying; work in small areas to avoid hard edges between strokes (Source 5).
Egg tempera application

refining

step 03
Build up the forms using short, linear strokes (hatching). Do not blend wet-on-wet. Use ochres and earths for broken tones, as they cover well and dry easily (Source 1).
Tip — Avoid the 'luxury of personages' or material appreciation over soul; focus on the emotional idea (Source 1).
Hatching/Stippling
step 04
Add highlights with chalk white or mixed lighter tones. Use the 'vitality possessed by the medium' to express feeling, not just visual deception (Source 6).
Tip — Remember that art is an expression of feeling, not a substitute for nature (Source 6).
Highlighting

finishing

step 05
Review the composition for rhythmic force. Ensure that lines direct the spectator's attention to the principal subject, avoiding distraction by the corners (Source 7).
Tip — Check if the 'right angle' at the corners is too arresting; soften with dark masses if necessary (Source 7).
Compositional balance

critical techniques

Egg Tempera Mixing

Pigments are mixed with egg yolk, a water-soluble binder. This creates a permanent, fast-drying medium (Source 5).

Linear Stroke Application

The artist must respect the limitations of the medium, not attempting illusionistic effects that oil paint might allow (Source 6).

Use of Earth Pigments

Ochres and marls are used for broken tones and their fixedness. They are preferred for their covering power and ease of drying (Source 1).

common pitfalls

→Attempting to blend colors wet-on-wet, which is impossible with fast-drying egg tempera (Source 5).
→Over-modeling or becoming 'too much tied down to your outline' without achieving the necessary finish (Source 2).
→Ignoring the 'vitality of the medium' in favor of deceptive naturalism, which results in a 'meretricious attempt to deceive the eye' (Source 6).
→Using unstable pigments that may change chemically; stick to substantial, fixed earths and traditional pigments (Source 1).

what the sources don't tell us

Where the corpus is silent, we say so rather than guess. These are the gaps a complete recreation guide would normally cover that our source passages don't.

·Specific visual details of St. Catherine’s attire, facial expression, or gestures are not described in the provided sources.
·The exact dimensions of the panel are not available.
·The specific year of creation is not available, though it is attributed to the Early Renaissance period.
·Details about the workshop system’s involvement in this specific panel are not explicitly stated, though general Netherlandish practices suggest possible assistant involvement in prosaic passages (Source 4).

grounded in

The technical procedure in this guide traces to the following classical art-instruction texts.

The Science of Painting↗
- CHAPTER V. COLOURING SUBSTANCES — applied to Selection of pigments (ochres, chalk white, cinnabar) and their properties (fixedness, covering well).
The Practice of Oil Painting↗
- ON COPYING — applied to Advice on copying works to correct weaknesses in finish or outline adherence.
The Practice and Science of Drawing↗
- XX MATERIALS — applied to Philosophy of using the medium’s vitality rather than seeking deceptive naturalism.
- ILLUSTRATING SOME OF THE LINES... — applied to Compositional principles regarding rectangular formats and directing the eye.

cross-referenced from

Named facts about this artwork and artist were checked against these reference pages.

Wikipedia: Tempera↗
- Tempera — part 1 — applied to Definition and properties of egg tempera (fast-drying, egg yolk binder).
Wikipedia: Early Netherlandish painting↗
- Early Netherlandish painting — part 23 — applied to Context of religious devotion and workshop practices, though noting this is Netherlandish, it informs the general altarpiece context.
Wikipedia bio — Sandro Botticelli↗
- part 1 — applied to Confirmation of Botticelli’s panel painting practice and drawing habits.