plate no. 3853

St. Peter Consacrates St. Lawrence as Deacon

fresco, wallEarly Renaissancereligious paintingfiguresarchitecturereligious scenecolumnsrobesceremony

recreation guide

This artwork, 'St. Peter Consacrates St. Lawrence as Deacon' (1449), is a fresco located in the Niccoline Chapel at the Vatican. It is part of a sumptuously painted scheme that likely involved assistance from Benozzo Gozzoli and Gentile da Fabriano, featuring extensive use of gold leaf for borders and decoration, as well as brilliant blue made from lapis lazuli (Source 1). The work exemplifies Fra Angelico’s Early Renaissance style, which combines late Gothic decorative conventions—such as gilded haloes and gold-edged garments—with emerging Renaissance principles of solidity, three-dimensional form, and naturalism (Source 6). The figures are rendered with physical weight and drapery that follows the body's structure, distinguishing them from earlier Gothic examples (Source 6).

estimated time

40-60 hours over 10-14 sessions (due to the strict time constraints of wet plaster application)

materials

6 items

steps

6 in sequence

materials

item	purpose	modern equivalent
Lime plaster (slaked lime and sand)	To create the intonaco layer for buon fresco technique	Hydraulic lime plaster or traditional slaked lime mix
Lapis Lazuli pigment	To create the brilliant blue tones characteristic of the Niccoline Chapel	Ultramarine blue (synthetic or natural)
Gold leaf	For borders, decoration, and haloes, consistent with Gothic conventions in Angelico's work	23k gold leaf
Vermilion and Azurite pigments	Standard pigments in Angelico's palette for reds and blues	Cinnabar (vermilion) and Azurite
Water	Vehicle for dry-powder pigment to merge with plaster	Distilled water
Charcoal or reddish-brown pigment	For transferring the composition onto the arriccio undercoat	Charcoal sticks or sinopia pigment

preparation

surface prep

The wall must first be prepared with a rough, thick undercoat of plaster known as the arriccio (Source 4). Once dry, the composition is copied onto this surface using reddish-brown pigment or charcoal, allowing the artist to make necessary adjustments before the final plastering (Source 4).

underdrawing

The master painter’s composition is transferred to the dry arriccio undercoat using charcoal or reddish-brown pigment (Source 4). This allows for adjustments before the final intonaco is applied. Specific details of Fra Angelico’s underdrawing for this specific chapel are not detailed in the sources, but this was the standard Renaissance practice (Source 4).

underpainting

In true buon fresco, there is no separate underpainting layer; the pigment is applied directly to the wet intonaco. The pigment mixed with water sinks into the plaster, which becomes the medium holding the pigment (Source 3).

color palette

Brilliant Blue

Lapis Lazuli

Extensive use in the Niccoline Chapel decorations (Source 1)

Gold

Gold leaf

Borders, decoration, haloes, and gold-edged garments (Source 1, Source 6)

Vermilion

Vermilion pigment

General use in Angelico's palette, noted in his altarpieces (Source 6)

Azurite

Azurite pigment

General use in Angelico's palette, noted in his altarpieces (Source 6)

composition

The sources do not describe the specific compositional layout of 'St. Peter Consacrates St. Lawrence as Deacon.' However, Fra Angelico characteristically demonstrated an understanding of linear perspective, particularly in architectural settings like arcades (Source 6). His figures are rendered with greater solidity and three-dimensional form compared to earlier Gothic works, with drapery following the structure of the bodies beneath (Source 6).

step by step

underdrawing→first pass→refining→finishing

underdrawing

step 01
Prepare the wall with a rough arriccio undercoat. Once dry, transfer the composition using charcoal or reddish-brown pigment.
Tip — Ensure the undercoat is fully dry before transferring the design.
Arriccio preparation

first pass

step 02
Apply a thin layer of wet, fresh lime plaster (intonaco) only to the area that can be completed in one day (giornata).
Tip — The size of the giornata varies by complexity; a face might take an entire day, while sky areas can be done rapidly (Source 4).
Buon fresco / Giornata
step 03
Mix alkaline-resistant pigments with room temperature water. Apply directly to the wet intonaco.
Tip — No binder is required; the pigment sinks into the plaster (Source 3).
Buon fresco application

refining

step 04
Work quickly. The plaster dries in reaction to air, fixing the pigment particles via carbonatation.
Tip — Mistakes are difficult to correct; the work must be done quickly without errors (Source 4).
Carbonatation

finishing

step 05
Apply gold leaf for borders, haloes, and decorative elements, consistent with the sumptuous decoration of the Niccoline Chapel.
Tip — This may involve fresco-secco techniques if applied to dry plaster, or specific preparation for adhesion.
Gold leaf application
step 06
If necessary, use fresco-secco techniques with organic binders for details that require longer working time or retouching.
Tip — Colors applied this way do not become part of the wall and may flake over time (Source 5).
Fresco-secco

critical techniques

Buon Fresco

Painting with pigment ground in water on wet lime mortar. The pigment is absorbed by the wet plaster and fixed by carbonatation, creating a durable lime crust (Source 4).

Giornata

Dividing the work into sections that can be completed in a single day due to the drying time of the plaster (Source 4).

Gold Leaf Decoration

Extensive use of gold leaf for borders and decoration, reflecting Gothic conventions in Angelico's work (Source 1, Source 6).

common pitfalls

→Attempting to paint on dry plaster without using appropriate binders (fresco-secco), which leads to flaking (Source 5).
→Working too slowly on the wet intonaco, causing the plaster to dry before the pigment is fixed (Source 4).
→Making mistakes that cannot be easily corrected due to the rapid setting time of the lime plaster (Source 4).
→Using non-alkaline-resistant pigments, which may degrade in the high pH environment of wet lime plaster (Source 4).

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 iconographic details of St. Peter and St. Lawrence in this particular scene are not described in the sources.
·The exact extent of assistance from Benozzo Gozzoli and Gentile da Fabriano in this specific panel is not detailed.
·Specific brushwork techniques or stroke patterns used by Fra Angelico are not described.
·The precise chemical composition of the arriccio and intonaco used in 1449 is not provided.

cross-referenced from

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

Wikipedia bio — Fra Angelico — part 9↗
- Niccoline Chapel — applied to Overview, materials (gold, lapis lazuli), and collaborative context
Wikipedia: Buon fresco — Buon fresco — part 1↗
- Description — applied to Step-by-step process, critical techniques, and surface prep
Wikipedia: Fresco — Fresco — part 1↗
- Buon fresco pigment — applied to Underpainting and pigment application
Wikipedia bio — Fra Angelico — part 6↗
- Altarpieces — applied to Style overview, color palette, and compositional habits
Wikipedia: Fresco-secco — Fresco-secco — part 1↗
- Fresco secco — applied to Finishing steps and common pitfalls