plate no. 7869

An Eruption of Vesuvius, seen from Portici

oil, canvasRomanticismlandscapevolcanoeruptionlandscapenightcloudsmountains

what to study here

It is a clear lesson in building drama from one light source, a restrained bright core, and a strict three-part value plan.

Study how the whole picture is organized around a single light source. The crater is the only origin of light, and it throws warm radiance upward through the smoke and across the foreground. The value structure is extreme: near-black darks in the upper sky and foreground, a mid-value group of lit clouds and terrain receiving reflected light, and the lightest lights confined to the crater and immediate plume, where yellow reaches near-white. Notice that the foreground is not simply dark. It reads as warm and lit, but stays below the eruption in brightness, so the eye rests on the volcano. Look at the edges. The glow feathers softly into the surrounding clouds, and the brushwork in the sky follows the movement of the smoke. The cone and foreground have slightly firmer edges for definition, though none are hard. Small figures in the lit foreground give scale. A few stars in the darkest sky ground the night setting. Copy the value plan first, in three masses, before any color. If either extreme softens, the drama collapses.

key decision

The painter confined the lightest lights to the crater and immediate plume and set them against near-black sky, with soft feathered edges bridging the two. Lit mid-values in clouds and terrain carry the rest of the effect.

recreation guide

Joseph Wright of Derby’s *An Eruption of Vesuvius, seen from Portici* (1776) is a quintessential example of his mastery of chiaroscuro, a technique for which he is widely noted in art-historical record (Source 3). The painting exemplifies the Romantic landscape genre, where the primary subject is a wide view of natural scenery, often emphasizing dramatic weather and light effects (Source 6). Wright’s approach likely involves the deliberate juxtaposition of high and low tones to produce a 'true gradation of light,' where the highest tones are enfeebled and the lowest heightened at the line of juxtaposition (Source 1). This creates a spontaneous contrast that harmonizes the inherent colors of the volcanic landscape with the chosen atmospheric effects.

estimated time

20-30 hours over 5-7 sessions

materials

5 items

steps

5 in sequence

materials

item	purpose	modern equivalent
Oil paints (pigments)	Primary medium for creating rich, dense color and flexible layers	Standard tube oil paints
Drying oil (Linseed or Poppy seed)	Binder for pigments; provides flexibility and sheen	Stand oil or refined linseed oil
Turpentine	Thinner for initial layers and cleaning	Odorless mineral spirits or pure gum turpentine
Canvas	Support for the oil painting	Linen or cotton canvas, primed
Varnish (optional, for glazing)	To mix with oil for transparent glazes, enhancing depth	Dammar varnish or resin-based glazing medium

preparation

surface prep

The canvas should be prepared with a ground suitable for oil painting. While Wright’s specific ground recipe is not detailed in the sources, the general practice of the period involved preparing a surface that allows for the 'greater flexibility, richer and denser color' advantages of oil (Source 4). A neutral or warm-toned ground may be beneficial to facilitate the subsequent glazing and scumbling techniques.

underdrawing

Sources do not explicitly describe Wright’s underdrawing method for this specific work. However, given the emphasis on 'great effects' and spontaneous contrast (Source 1), the underdrawing likely served to establish the broad masses of light and shadow rather than fine linear detail. It is consistent with the artist’s general practice to focus on the arrangement of light sources and their impact on the scene.

underpainting

A grisaille (monochrome underpainting) is highly recommended. The sources suggest that completing a preparation by 'mentally extracting the red and yellow colours' and translating what would be left in nature is a valid method (Source 5). This monochrome layer establishes the chiaroscuro structure, allowing the artist to focus on tone before introducing color. Wright’s noted use of chiaroscuro (Source 3) supports a strong tonal foundation.

color palette

Black

Ivory Black or Lamp Black

Establishing the darkest tones and shadows, consistent with the Greek painters' limited palette mentioned as a model for simple methods (Source 1)

White

Lead White or Titanium White

Highlights and the brightest parts of the eruption and sky, creating the highest tone bands (Source 1)

Red

Vermilion or Red Lake

The fiery glow of the eruption and reflected light on clouds; applied via glazing over the monochrome (Source 5)

Yellow

Yellow Ochre or Cadmium Yellow

The intense light of the volcano and atmospheric haze; applied via glazing (Source 5)

Blue

Ultramarine or Cobalt Blue

The sky and distant landscape shadows; used in the initial monochrome stage (Source 5)

composition

The composition is a landscape view, likely depicting a specific place (Portici) with the eruption as the dominant natural event (Source 6). Wright characteristically uses dramatic chiaroscuro to illuminate the scene, similar to his moonlit landscapes where light makes elements 'sparkle in contrast to the dusky landscape' (Source 3). The arrangement likely prioritizes the contrast between the bright eruption and the dark foreground, adhering to the principle that 'many small ones resulted from [great effects]' (Source 1).

step by step

underdrawing→underpainting→first pass→refining→finishing

underdrawing

step 01
Sketch the basic composition, focusing on the placement of the volcano, the town of Portici, and the sky. Emphasize the broad masses of light and shadow rather than fine details.
Tip — Ensure the light source (eruption) is clearly defined to guide the chiaroscuro.
Compositional sketching

underpainting

step 02
Create a grisaille using black, ultramarine, and white (or similar neutral tones). Establish the full range of tones from the darkest shadows to the brightest highlights.
Tip — Mentally extract red and yellow colors, focusing on the tonal structure as if these colors were not present (Source 5).
Grisaille

first pass

step 03
Once the grisaille is dry, begin glazing with transparent coats of red and yellow oil colors. Apply these tones where the light from the eruption would reflect.
Tip — Glazing is a transparent coat of color that allows the underlying painting to show through, creating depth (Source 5).
Glazing

refining

step 04
Use scumbling (semi-opaque painting) to adjust tones and create atmospheric effects, such as the smoke and haze. Scumbling over darker grounds can create a 'grey bloom' or coldness (Source 5).
Tip — Be aware that scumbling tends to coldness when used over darker grounds (Source 5).
Scumbling

finishing

step 05
Refine the contrasts at the boundaries of light and shadow. Ensure that the highest tones are enfeebled and the lowest heightened at the line of juxtaposition to produce a true gradation of light (Source 1).
Tip — Pay attention to the simultaneous contrast of colors; adjacent colors will influence each other's appearance (Source 2).
Chiaroscuro/Contrast

critical techniques

Chiaroscuro

Wright is noted for his dramatic use of chiaroscuro, particularly in candlelit and moonlit scenes (Source 3). In this painting, it is used to contrast the bright eruption with the dark landscape, creating a 'true gradation of light' through juxtaposition (Source 1).

Glazing and Scumbling

These methods were practiced by old masters and are useful for achieving rich color effects. Glazing adds transparent color, while scumbling adds semi-opaque layers, allowing for subtle tonal adjustments (Source 5).

Simultaneous Contrast

Understanding that adjacent colors influence each other helps in harmonizing the composition. The painter must perceive the modifications of tone and color received from contiguous colors (Source 2).

common pitfalls

→Failing to allow the grisaille to dry completely before glazing, which can muddy the colors (Source 5).
→Ignoring the effects of simultaneous contrast, leading to inaccurate color perception and disharmony (Source 2).
→Overworking the details before establishing the great effects of light and shadow, which should produce many small effects spontaneously (Source 1).
→Using opaque colors exclusively, missing the depth and richness achievable through glazing (Source 5).

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 pigment recipes used by Wright in 1776 are not detailed in the sources.
·The exact underdrawing technique (e.g., charcoal, chalk, ink) is not specified.
·The specific varnish or resin Wright used for glazing is not identified, though general practices are described.
·Detailed compositional elements (e.g., specific figures or buildings in Portici) are not described in the sources, so they must be inferred from general landscape conventions or external knowledge not provided here.

grounded in

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

Laws of Contrast of Colour↗
- 6. Put beside each other two flat tints... — applied to Chiaroscuro and contrast principles
- 315. As to the advantages the painter will find in it... — applied to Color perception and harmony
The Practice of Oil Painting↗
- COLOURING A MONOCHROME — applied to Grisaille, glazing, and scumbling techniques

cross-referenced from

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

Wikipedia bio — Joseph Wright↗
- part 3 — applied to Artist's use of chiaroscuro and dramatic lighting
Wikipedia: Oil painting↗
- part 1 — applied to General oil painting advantages and materials
Wikipedia: Landscape painting↗
- part 1 — applied to Genre context and composition

Read more about the corpus on the sources page and how the guides are built on the methods page.

read from the painting

observed from the image, not the label

6 dominant colors, measured

what the eye sees

The volcano dominates the composition center-right, erupting with an intense orange-yellow glow that illuminates towering clouds and the surrounding darkness. The light source is the crater itself, throwing warm radiance upward through roiling smoke and casting a supernatural glow across the foreground landscape. The eye is drawn immediately to the brilliant eruption column, which creates a vertical axis of light against nearly black sky; the composition uses the contrast between the incandescent glow and near-total darkness to create drama. Small figures dot the illuminated foreground terrain, giving scale to the catastrophic event. Stars punctuate the darkest portions of the upper sky, grounding the night scene.

value structure

The value structure hinges on extreme contrast: near-black shadows dominate the composition, with the brightest lights concentrated in the volcanic glow where yellows reach near-white. A distinct mid-value group comprises the illuminated clouds and terrain receiving reflected light from the eruption. The darkest darks anchor the foreground and sky away from the glow; the lightest lights are confined to the crater and immediate plume. Squint and you see two dominant masses: the dark landscape below and the bright sky above, with the volcano's glow as the bridge.

observed palette and mixes

#070d08
ivory black + ultramarine blue, heavy black
the deepest shadows in the upper sky and dark foreground, nearly pure black
#1a1c13
ultramarine blue + burnt umber + black
dark night sky away from the glow and shadowed cloud masses
#55361c
burnt umber + alizarin crimson
the mid-dark terrain in the foreground, the shadowed base of the volcano
#aa6122
cadmium yellow + alizarin crimson + burnt umber
the illuminated orange-brown of the cone and foreground receiving volcanic light
#2b2619
burnt umber + black + ultramarine
dark brownish shadows in the lower landscape and volcano's silhouette edge
#fff8dc
titanium white + cadmium yellow
the brightest core of the eruption glow, the most intense highlights

edges and brushwork

The volcano's glow features soft, blended edges where the bright center feathers into surrounding clouds—this is the painting's technical signature. Brushwork is loose and directional in the sky, following the movement of smoke and clouds with visible strokes that suggest atmospheric turbulence. The foreground terrain and volcano silhouette have slightly sharper edges for definition, but never hard; the overall handling is painterly and romantic rather than photographic.

a working sequence

01
Establish the toned ground and darken the sky
Tint your canvas with a mixture of ultramarine blue, burnt umber, and black—a dark, cool-toned base. Work this across the entire surface, leaving it slightly lighter where the volcano's glow will brighten the sky. This sets your darkest value anchors immediately.
02
Block in the volcano's silhouette and crater position
Use a mix of burnt umber and black to define the cone's triangular mass against the sky. Place it slightly right of center. Lightly indicate where the brightest glow will occupy the upper crater area—this is your focal point.
03
Begin the luminous glow—the brightest lights
Mix cadmium yellow with a touch of titanium white and apply this to the core of the eruption column, feathering outward. This is your brightest value—use it sparingly and only at the crater and the top of the plume. Don't blend it into surrounding areas yet.
04
Build the intermediate orange-red tones
Mix alizarin crimson with cadmium yellow to create warm oranges. Apply this around the glow, suggesting the hot gases and lit clouds. Blend edges softly into the dark sky and allow this mid-warm value to transition between the bright core and the nearly black surrounding atmosphere.
05
Define the illuminated clouds and smoke
Using your orange-yellow mixtures with varied amounts of white and black, model the turbulent clouds that frame the eruption. Pay attention to how the volcanic light illuminates the underside and edges of clouds—these should be warmer and lighter than the sky proper. Keep edges soft and atmospheric.
06
Work the foreground terrain and figures
The ground in the lower third receives warm light from the eruption. Use burnt umber, alizarin crimson, and cadmium yellow to create the illuminated landscape—it should feel warm and receiving light, not merely dark. Indicate small figures as shadows or silhouettes. Keep this area looser than the sky; the eye should rest on the volcano, not the ground.
07
Refine the volcano's form and silhouette
Sharpen the cone's edge where it meets the glow—the contrast between the dark rock and the incandescent core should be crisp. Use darker, cooler mixtures (ultramarine blue + burnt umber) to define the lit side of the cone and deepen shadows. Avoid making it too opaque; it should read as a solid form against the light.
08
Final luminosity and atmospheric passes
Step back and evaluate value relationships. The glow may need softening at edges through feathered blending. Stars can be added as tiny titanium white dots in the darkest sky. Ensure the foreground doesn't compete with the volcano—it should feel distant and shadowed, bathed in reflected warm light but never as bright as the eruption itself.

where studies of this painting go wrong

The glow is easy to paint too harshly or too pale—resist the urge to over-lighten it with pure white. The brightest value should be warm (yellow-tinted) and restrained in area; let surrounding mid-tones do much of the work.
Clouds around the volcano can become opaque and lose the sense of atmospheric smoke—keep edges soft, blend carefully, and allow dark sky to show through in places to preserve the sense of murk and distance.
The foreground terrain can accidentally steal focus if painted too brightly or with too much detail. It should feel dark, rough, and distant—a stage for the volcano's drama, not a subject in itself.
The value contrast between the brightest glow and the darkest sky is extreme; if either extreme softens too much, the drama collapses. Commit fully to the extremes without fear of harshness.

measured difficulty