This weekend we’re visiting what used to be a small village on the bank of the River Oise, where several of the French Impressionists developed their skills in painting landscapes en plein air. In yesterday’s first article we had reached 1876, the year of the second Impressionist Exhibition in Paris.

In complete contrast to his few landscapes influenced by Paul Cézanne, in 1876 Pissarro also painted some views of the commercial barges trading on the River Oise, including this of Barges at Pontoise, the only canvas in which the boats dominate his composition. This painting remained unsold at the time of the artist’s death, and wasn’t even exhibited until 1936.

The Oise near Pontoise in Grey Weather is another of Pissarro’s views of the River Oise from 1876.

The Rainbow, Pontoise, which Pissarro painted in 1877, was shown at the Third Impressionist Exhibition that year. It’s a panoramic view of the fields around the neighbouring area of Épluches viewed from Pontoise, with a modest and realistic rainbow.

Around 1877, when Pissarro was probably in company with Paul Cézanne at Pontoise, the pair of them painted the same motif hidden or revealed by the same trees. Pissarro’s version of Côte des Bœufs, Pontoise, above, is the more famous, and captures texture in everything, from the smoother surface of the track to the smaller branches, and presents an essay on the form and structure of trunks and branches.

Cézanne’s La Côte Saint-Denis à Pontoise shows little or no anatomical basis to the construction of his trees, whose branches are only loosely related to foliage. He simplifies throughout, with little or no texture, and more basic shadows, on the trunks, and the foliage is depicted as amorphous areas of leaf colour.

Béliard’s Moulin de Chauffour, Effect of Snow (1878) is another winter scene from the area near Pontoise, and is significantly less painterly than Pissarro or Cézanne.

By 1880, when Pissarro painted this Landscape at Le Valhermeil, Auvers-sur-Oise, his work was losing its conventional Impressionist facture, as he adopted smaller, staccato brushstrokes and his style became more ‘pointillist’.

Pissarro also started to transfer his attention from the land to its inhabitants, here the rural poor of these Cottages at Le Valhermeil, Auvers-sur-Oise (1880).

Pissarro’s Peasant Woman Digging, the Jardin de Maubuisson, Pontoise (1881) shows two women working in the vegetable garden of this large house in the village. This painting was first shown at the seventh Impressionist Exhibition the following year.

The Harvest, Pontoise, from 1881, is one of several of Pissarro’s paintings focussing more closely on agricultural activities, and now becoming overtly ‘pointillist’. Because of the brushwork involved, he couldn’t have painted this in front of the motif, and it turns out to be a second copy of an earlier and apparently identical painting.

This increasingly human content, in paintings such as his Peasant Woman and Child Returning from the Fields, Auvers-sur-Oise from 1881, drew comparisons with Millet, from whom Pissarro sought to distance himself in terms of modernity. This painting was bought by Durand-Ruel later that year, and shown at the seventh Impressionist Exhibition.

Pissarro later concentrated his attention on Éragny, then cityscapes of Paris. Cézanne returned to his family home in Aix-en-Provence, and Béliard became the mayor of Étampes further south. Today Pontoise is part of the ‘new town’ of Cergy-Pontoise, and its population has grown to well over 30,000, within an urban area of nearly a quarter of a million.

This weekend we travel to what used to be a small village of around six thousand on the bank of the River Oise, to the north-west of Paris. Pontoise was the centre of early Impressionist landscape painting in front of the motif, and appears in hundreds of works painted there from the late 1860s. It’s where Camille Pissarro lived and developed his skills, Paul Cézanne learned to paint en plein air, and others including Vincent van Gogh and Charles Daubigny painted.

The country around Pontoise has also been painted extensively. In these two articles, I include some from Auvers-sur-Oise, a little upstream, but exclude those from Ennery to the south, Éragny down river, where Pissarro settled later, and Osny to the north-west, all names you’ll see in the titles of significant Impressionist paintings.

We start in 1867, in the early days of the development of Impressionism, with Camille Pissarro’s Côte de Jalais, Pontoise. This realist view shows the hill of Les Jalais at l’Hermitage, where Pissarro lived at the time, viewed from the Chemin des Mathurins in Pontoise.

The year after he painted these Apple Trees at Pontoise, the House of Père Gallien (1868), the Pissarro family moved to Louveciennes, also to the north-west of Paris, where they intended to settle down in a large rented house. It was here that Pissarro first got to know Alfred Sisley well, when they painted in company, and alongside Monet and Renoir, all four of them starving and fighting off despair from their lack of sales.

The forgotten Impressionist Édouard Béliard may well have painted Boulevard de Fossés in Pontoise alongside Pissarro, Cézanne and Guillaumin in 1872.

Béliard’s Pontoise, View of the Lock (1872-5) was probably among his paintings shown at the first Impressionist Exhibition in 1874. Its composition is reminiscent of Sisley’s The Canal Saint-Martin, Paris from 1872, and its style is similar to those of Pissarro and Sisley at that time.

Paul Cézanne started learning to paint en plein air alongside Pissarro’s easel in 1873, when he painted this view of the House of Père Lacroix, Auvers-sur-Oise. As with all beginners, he took a long time getting the painting to look right, so different sections of the roof were painted several hours apart, as reflected in the orientation of the shadows here.

This view from Cézanne’s first campaign along the River Oise shows the northern bank near the hamlet of Valhermeil, slightly up-river from Pontoise.

Of all the paintings shown at the first Impressionist Exhibition in Paris in 1874, Cézanne’s The Hanged Man’s House, Auvers-sur-Oise (1874) was among the most successful, as he sold it to the collector Count Doria for three hundred francs.

Béliard’s Pothuis Quay in Pontoise, Effect of Snow from 1875 may have been exhibited at the second Impressionist Exhibition in 1876, and is similar in subject and style to the winter scenes painted around Louveciennes by Pissarro and Sisley from 1870 onwards.

In February 1875, with snow still falling, the Pissarros returned to their house in Pontoise, for Camille to paint there again. Effect of Snow at L’Hermitage, Pontoise (1875) strikes a fine balance between an impression captured in haste, and sufficient detail to make it more than just a passing moment.

That year a few of Pissarro’s paintings appear to have been influenced by Cézanne. Perhaps the best example is The Small Bridge, Pontoise, which could easily be mistaken for one of Cézanne’s views in the woods of northern France.

View of the Côte des Gratte-Coqs, Pontoise from the same year is also less distinctively one of Pissarro’s works.

In 1876, Pissarro painted this large view of one of the gardens in Pontoise: The Garden of Les Mathurins at Pontoise, belonging to the Deraismes Sisters. In fact, the sisters were only renting this large and impressive property, just down the road from where the Pissarros lived, in the Hermitage district of Pontoise. It had formerly been a convent until the French Revolution.

The element chromium gains its name from the rich colours seen in many of its salts and compounds. One of them, chromium oxide, was discovered in about 1798 by Louis-Nicolas Vauquelin, who immediately recognised its future use as a pigment, because of its “fine emerald colour”. But painters were still enamoured with more toxic greens, and straight chromium oxide doesn’t look particularly brilliant, being a rather dull yellow-green. Its introduction into paintings probably didn’t start until around 1840, when landscape painting outdoors was becoming all the rage.

Some of the earliest paintings known to use chromium oxide are those of Moritz von Schwind, of which the first example that I can show is his Mermaids Watering a Stag from about 1846. He seems to have used the pigment quite extensively here in foliage, although probably in combination with other pigments.

Von Schwind’s King Krokus and the Wood Nymph from about 1855 is a clearer image, where he probably used chromium oxide in combination for most of his greens.

As these works were being painted, an improved version of chromium oxide was being developed: hydrated chromium oxide, which became known as viridian during the 1860s. This first became available at a reasonable price after Guignet started to make it in quantity in 1859, so has also been known as Guignet’s green. It’s sometimes termed émeraude or emerald, which only serves to confuse viridian with copper acetoarsenate, more widely known as emerald green.

Viridian came into use during the 1860s, and has proved far more popular than chromium oxide. Both pigments are reliably lightfast, opaque, and have good covering power, but viridian is the more intense, and doesn’t appear dull like plain chromium oxide.

Anselm Feuerbach’s painting of Paolo and Francesca from 1864 is one of the earlier works found to contain viridian among its many rich greens.

The best example showing off the colour of viridian is perhaps Édouard Manet’s The Balcony (1868-69), where he appears to have used the pigment throughout the blinds and railings, most probably mixed with lead white, and unmixed for the woman’s parasol.

Arnold Böcklin’s Triton and Nereid from 1874 is unusual in several respects. It’s reported as being painted in tempera rather than oils, but its deep lustrous greens were developed using a base of predominantly viridian, over which Böcklin applied a copper resinate glaze.

Pierre-Auguste Renoir’s La Yole (The Skiff) of 1875 uses viridian as the main colour for the reeds in the left foreground.

Analysis of Claude Monet’s series of paintings of the Gare Saint-Lazare in 1877 has revealed extensive use of viridian in mixtures, including the green shadows in the roof. In Arrival of the Normandy Train, Gare Saint-Lazare (1877), the pigment is apparent (and confirmed) throughout the green foreground of the platform, an optical effect resulting from light passing through the glass roof of the station.

Renoir used viridian together with malachite green and other pigments for the greens in his Chrysanthemums (1881-82).

If you care to spend some time examining the myriads of tiny dots in Georges Seurat’s monumental Divisionist painting of A Sunday Afternoon on the Island of La Grande Jatte (1884-86), I’m assured that you’ll find many of those forming its vegetation contain viridian.

Viridian remained popular among the post-Impressionists, from whom I have two well-known paintings as examples.

Vincent van Gogh included viridian in the pigments used in the range of greens in his A Wheatfield, with Cypresses (1889), which is more unusual for his use of ultramarine blue mixed to form green.

Paul Cézanne is known to have had a strong preference for viridian as one of the key colours in his palette. However, in his Hillside in Provence (1890-92), it is emerald green that is the more prominent, and the major part of the painting’s more brilliant greens, even into its pale turquoise sky. Some green passages, such as the patch of yellow-green grass at the edge of the path in the foreground, at the right edge of the canvas, have been built with a base of lead white and viridian, over which he has applied a yellow lake glaze.

Chromium oxide and viridian remain widely available today; although the former is not popular or widely used, viridian remains a mainstay green widely recommended for its colour and other properties. Being virtually insoluble, chromium oxide and viridian pose minimal risks of toxicity to the artist. However, there is growing concern over their environmental effects, and great care is needed when handling waste paint containing either pigment.

Reference

Richard Newman (1997) Artists’ Pigments, vol 3, ed Elisabeth West FitzHugh, Archetype. ISBN 978 1 904982 76 0.

Rumours still abound as to the cause of Napoleon’s death over two centuries ago. One theory, not currently in favour, is that he was poisoned by arsenic in the wallpaper. At the time, that would have been unusual, but by the 1860s such deaths were significant enough to be reported in newspapers. Their ultimate cause was also one of the factors behind the success of Impressionist landscape painting: emerald green.

Getting a good range of green pigments was vital for landscape painting, and more generally for coloured commercial products such as wallpaper and clothing. The first of the ‘poison greens’ to be discovered was that named after Carl Wilhelm Scheele, the Swedish chemist who originally made it in 1775: copper arsenite, a highly toxic salt of arsenic. Soon after its introduction from about 1780, it became clear that it tended to darken with age, and the search began for a replacement.

Little attention has been paid to the use of Scheele’s green, and it isn’t clear how widely it was used, or even when it was first used in painting.

JMW Turner’s early oil sketch of Guildford from the Banks of the Wey, painted in about 1805, has been found to contain Scheele’s green. Given its range of greens, that could be quite extensive.

Wilhelm Sattler, a paint manufacturer in Schweinfurt, Germany, worked with Friedrich Russ to discover an even better arsenic compound for use as a colourant, and from 1814 Sattler’s company manufactured Schweinfurt or emerald green, the equally toxic copper acetoarsenite. Its alluringly brilliant green colour appears very stable, with only slight darkening resulting from reaction with hydrogen sulphide, a common atmospheric pollutant.

By about 1830-32, when Turner painted Going to School as an illustration for Rogers’s Poems, he had switched to using emerald green, obvious from its characteristic colour standing out from the small bag on the boy’s back.

Turner used emerald green again in this watercolour painting of Rouen, Looking Downstream from about 1832, here in combination with other pigments, so less brashly.

Concerns over the established toxicity of these two greens were raised by 1839, when warnings were first issued in Bavaria. Despite those, the use of emerald green became more widespread, and it was even ‘fixed’ to ball gowns using albumen or dextrin, which allowed its poisonous dust to brush free from the garment when dancing. It also became particularly popular, and insidiously toxic, in coloured wallpapers. When applied on damp walls, as were common at the time, fungal products could produce trimethyl arsine gas, which is thought to have been responsible for many of the symptoms and deaths that were reported.

Édouard Manet’s Music in the Tuileries (1862) is an unusual example of a painting containing both Scheele’s and emerald greens. Manet used them in combination in two different glazes applied to the areas of foliage. In one transparent glaze, they are mixed with yellow lake, small amounts of ivory black, and yellow ochre; the other more opaque glaze consists of the two greens, with yellow ochre and white.

The last recorded use of Scheele’s green was by Edwin Landseer in 1866.

The Impressionists relied heavily on emerald green for its brilliance and intensity of colour. Frédéric Bazille’s Self-Portrait with Palette (1865) shows some emerald green paint on his palette, squeezed out and ready to paint vegetation such as sunlit grass.

Claude Monet used emerald green among other green pigments and mixtures in his famous Bathers at la Grenouillère, painted in 1869. It has also been found widely in the landscapes of Cézanne, Gauguin, Pissarro and Vincent van Gogh.

By the late nineteenth century, concern over the consequences of using emerald green in household products had risen to the point where the pigment was banned in a succession of countries.

Paul Gauguin’s Arlésiennes (Mistral) (Old Women at Arles) (1888) uses emerald green for the band of bright green grass sweeping up across the painting from the right. It is also mixed for the skin and hair of some of the figures, and in the foliage more generally.

Odilon Redon’s pastel painting of Sîta from about 1893 uses emerald green, chrome yellow and chalk in the prominent yellow-green halo surrounding the woman’s head. Working with soft pastels containing this pigment was particularly hazardous, because of the likelihood of inhaling their dust. At least today we have effective respiratory protection available.

During the twentieth century, genuine emerald green was withdrawn from use as a pigment, although it wasn’t completely discontinued until the 1960s. Since then, paints sold as being emerald green have contained alternatives that are far less toxic.

Emerald green has been found in mixtures used by Paul Cézanne in the patches of vegetation in his huge The Large Bathers (1906). Alongside lead white, vermilion and ultramarine blue, this pigment appears to have been among his most frequently used.

Childe Hassam’s watercolour of White Mountains from Poland Springs from 1917 is one of the last major paintings that appears to have relied on emerald green. Its use in the meadow in the foreground is perhaps the pigment’s last brash farewell.

Reference

Inge Fiedler and Michael Bayard (1997) Artists’ Pigments, vol 3, ed Elisabeth West Fitzhugh, Archetype. ISBN 978 1 904982 76 0.