Soft-paste porcelain

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Capodimonte porcelain soft-paste jar with three figures of Pulcinella from the commedia dell'arte, 1745-1750 Jar MET DP168331 (cropped).jpg
Capodimonte porcelain soft-paste jar with three figures of Pulcinella from the commedia dell'arte, 1745–1750
Chelsea porcelain, England, about 1765. Soft-paste decorated in enamel colours with a gold anchor mark. V&A Museum no. 528-1902 Victoria and Albert Museum, London Softpasteporcelain.jpg
Chelsea porcelain, England, about 1765. Soft-paste decorated in enamel colours with a gold anchor mark. V&A Museum no. 528-1902 Victoria and Albert Museum, London

Soft-paste porcelain (sometimes simply "soft paste", or "artificial porcelain") is a type of ceramic material in pottery, usually accepted as a type of porcelain. It is weaker than "true" hard-paste porcelain, and does not require either its high firing temperatures or special mineral ingredients. There are many types, using a range of materials. The material originated in the attempts by many European potters to replicate hard-paste Chinese export porcelain, especially in the 18th century, and the best versions match hard-paste in whiteness and translucency, but not in strength. [2] But the look and feel of the material can be highly attractive, and it can take painted decoration very well. [3]

Contents

The ingredients varied considerably, but always included clay, often ball clay, and often ground glass, bone ash, soapstone (steatite), flint, and quartz. They rarely included the key ingredients necessary for hard-paste, china clay including kaolin, or the English china stone, [4] although some manufacturers included one or other of these, but failed to get their kilns up to a hard-paste firing temperature. They were called "soft paste" (after the French "pâte tendre") either because the material is softer in the kiln, and prone to "slump", or their firing temperatures are lower compared with hard-paste porcelain, [5] or, more likely, because the finished products actually are far softer than hard-paste, and early versions were much easier to scratch or break, as well as being prone to shatter when hot liquid was suddenly poured into them. [6]

The German Meissen porcelain had developed hard-paste porcelain by 1708, and later German factories usually managed to find the secret out from former Meissen employees, as did Austrian Vienna porcelain in 1718. [7] The other European countries had much longer to wait, but most factories eventually switched from soft to hard-paste, having discovered both the secret and a source of kaolin. In France kaolin was only found in Limousin in 1768, and Sèvres produced both types from 1769, before finally dropping soft-paste in 1804. [8] In England there was a movement in a different direction, as Spode's formula for bone china, developed in the 1790s, was adopted by most other factories by about 1820. By that point little soft-paste porcelain was being made anywhere, and little hard-paste in England, with Nantgarw (to 1820) and Swansea in Wales among the last factories making soft-paste. [9]

Background

Saint-Cloud manufactory soft porcelain bowl, with blue decoration under glaze, 1700-1710. Saint Cloud bowl soft porcelain with blue decorations under glaze 1700 1710.jpg
Saint-Cloud manufactory soft porcelain bowl, with blue decoration under glaze, 1700–1710.

There were early attempts by European potters to replicate Chinese porcelain when its composition was little understood and its constituents were not widely available in the West. The earliest formulations were mixtures of clay and ground-up glass (frit). Soapstone (steatite) and lime are also known to have been included in some compositions. The first successful attempt was Medici porcelain, produced between 1575 and 1587. It was composed of white clay containing powdered feldspar, calcium phosphate and wollastonite (CaSiO3), with quartz. [10] [11] Other early European soft-paste porcelain, also a frit porcelain, was produced at the Rouen manufactory in 1673, which was known for this reason as "Porcelaine française". [12] Again, these were developed in an effort to imitate high-valued Chinese hard-paste porcelain. [12] As these early formulations slumped in the kiln at high temperatures, they were difficult and uneconomic to use. Later formulations used kaolin (china clay), quartz, feldspars, nepheline syenite and other feldspathic rocks. Soft-paste porcelain with these ingredients was technically superior to the traditional soft-paste and these formulations remain in production.

Characteristics

Soft-paste formulations containing little clay are not very plastic [13] and shaping it on the potter's wheel is difficult. Pastes with more clay (now more commonly referred to as "bodies"), such as electrical porcelain, are extremely plastic and can be shaped by methods such as jolleying and turning. The feldspathic formulations are, however, more resilient and suffer less pyroplastic deformation. Soft-paste is fired at lower temperatures than hard-paste porcelain, typically around 1100 °C [14] [15] for the frit based compositions and 1200 to 1250 °C for those using feldspars or nepheline syenites as the primary flux. The lower firing temperature gives artists and manufacturers some benefits, including a wider palette of colours for decoration and reduced fuel consumption. The body of soft-paste is more granular than hard-paste porcelain, less glass being formed in the firing process.

A consistent problem was a tendency to shatter with the temperature shock of having hot or boiling water poured into a vessel that had not first been warmed up. To this day, English tea customs dictate warming the teapot with a little water before the tea is added and the main flow of water. Putting the milk into a teacup before the tea is also a common habit; both these go back to 18th-century soft-paste. After a number of complaints of not just teapots but even tureens breaking in this way, in 1790 William Duesbury II, owner of Royal Crown Derby, had to issue instructions to his customers on how to prevent this, by pouring a cup of cold water in, followed by some boiling water "and give it a shake round", to warm the pot before actually making the tea. [16]

Not surprisingly, Duesbury sought a formula that avoided this characteristic, and at some point after 1800 his successors introduced one closer to bone china. However, as other factories making this change found, the harder formulae did not take overglaze enamel paints as well, being both less attractive in appearance, and prone to crazing in the glaze, or paint losses. [17] Experts are prone to rhapsodize over both the feel and appearance of various versions of soft paste bodies from several factories, both when plain and painted, and prefer such pieces to those in later, more practical, types of porcelain body.

According to one expert, with a background in chemistry, "The definition of porcelain and its soft-paste and hard-paste varieties is fraught with misconceptions", [18] and various categories based on the analysis of the ingredients have been proposed instead. [19] Some writers have proposed a "catch-all" category of "hybrid" porcelain, to include bone china and various "variant" bodies made at various times. [20] This includes describing as "hybrid soft-paste porcelain" pieces made using kaolin but apparently not fired at a sufficiently high temperature to become true hard-paste, as with some 18th-century English and Italian pieces. [21]

At least in the past, some sources dealing with modern industrial chemistry and pottery production have made a completely different distinction between "hard porcelain" and "soft porcelain", by which all forms of pottery porcelain, including East Asian wares, are "soft porcelain". [22]

European soft-paste

Chinese porcelain, which arrived in Europe before the 14th century, was much admired and expensive to purchase. Attempts were made to imitate it from the 15th century onwards but its composition was little understood. Its translucency suggested that glass might be an ingredient, [23] so many experiments combined clay with powdered glass (frit), including the porcelain made in Florence in the late 16th century under the patronage of the Medicis. In Venice there were experiments supposedly using opaque glass alone. [24]

German factories either made hard-paste from their foundation, like Meissen, Vienna, Ludwigsburg, Frankenthal and later factories, or obtained the secret and switched. France did in fact make hard-paste at Strasbourg in 1752–54, until Louis XV gave his own factory, Vincennes, a monopoly, at which point the factory moved to become the Frankenthal operation. [7]

Early factories in France, England, Italy, Denmark, Sweden, Holland, Switzerland and other countries made soft-paste, the switch to hard-paste generally coming after 1750, with France and England rather in the rear, as explained below. [25] The American China Manufactory (or Bonnin and Morris) in Philadelphia, America's first successful porcelain factory, also made soft-paste from about 1770–72. [26]

France

Saint-Cloud manufactory soft porcelain vase, with blue designs under glaze, 1695-1700. Saint Cloud soft porcelain vase with blue designs under glaze 1695-1700.jpg
Saint-Cloud manufactory soft porcelain vase, with blue designs under glaze, 1695–1700.

Experiments at the Rouen manufactory produced the earliest soft-paste in France, when a 1673 patent was granted to Louis Poterat, but it seems that not much was made. An application for the renewal of the patent in 1694 stated, "the secret was very little used, the petitioners devoting themselves rather to faience-making". Rouen porcelain, which is blue painted, is rare and difficult to identify. [27]

The first important French porcelain was made at the Saint-Cloud factory, which was an established maker of faience. In 1702, letters-patent were granted to the family of Pierre Chicaneau, who were said to have improved upon the process discovered by him, and since 1693 to have made porcelain as "perfect as the Chinese". The typical blue-painted Saint-Cloud porcelain, says Honey, "is one of the most distinct and attractive of porcelains, and not the least part of its charm lies in the quality of the material itself. It is rarely of a pure white, but the warm yellowish or ivory tone of the best wares of the period is sympathetic and by no means a shortcoming; and while actually very soft and glassy, it has a firm texture unlike any other. The glaze often shows a fine satin-like pitting of the surface that helps to distinguish it from the brilliant shiny glaze of Mennecy, which is otherwise similar. The heavy build of the pieces is also characteristic and is saved from clumsiness by a finer sense of mass, revealed in the subtly graduated thickness of wall and a delicate shaping of edges." [28]

Louis Henry de Bourbon, prince de Condé established a soft-paste factory on the grounds of his château de Chantilly in 1730; Chantilly porcelain continued to be made after his death in 1740.

A soft-paste factory was opened at Mennecy by François Barbin in 1750. The Vincennes porcelain factory was established in 1740 under the supervision of Claude-Humbert Gérin, who had previously been employed at Chantilly. The factory moved to larger premises at Sèvres [29] in 1756. A superior soft-paste was developed at Vincennes, whiter and freer of imperfections than any of its French rivals, which put Vincennes/Sèvres porcelain in the leading position in France and throughout the whole of Europe in the second half of the 18th century. [30]

The use of frit in this paste lent it the names "Frittenporzellan" in Germany and "frita" in Spain. In France it was known as "pâte tendre" and in England "soft-paste", [28] perhaps because it does not easily retain its shape in the wet state, or because it tends to slump in the kiln under high temperature, or because the body and the glaze can be easily scratched. (Scratching with a file is a crude way of finding out whether a piece is made of soft-paste or not.)

England

The first soft-paste in England was demonstrated by Thomas Briand to the Royal Society in 1742 and is believed to have been based on the Saint-Cloud formula. In 1749, Thomas Frye, a portrait painter, took out a patent on a porcelain containing bone ash. This was the first bone china; only much later, around 1794, was the formula perfected by Josiah Spode, and then soon near-universally adopted in England. But bone ash was frequently an ingredient in English soft-paste. Remarkably little hard-paste porcelain has ever been made in England, and bone china remains the vast majority of English production to the present day.

Recipes were closely guarded, as illustrated by the story of Robert Brown, a founding partner in the Lowestoft porcelain factory, who is said to have hidden in a barrel in Bow to observe the mixing of their porcelain. [31] A partner in Longton Hall referred to "the Art, Secret or Mystery" of porcelain. [32]

In the fifteen years after Briand's demonstration, several factories were founded in England to make soft-paste table-wares and figures: [33]

Vase of so-called Chinese soft-paste, with crackle glaze and underglaze blue painting, Kangxi period (1662-1722) MET 14 40 329 O4 sf (cropped).jpg
Vase of so-called Chinese soft-paste, with crackle glaze and underglaze blue painting, Kangxi period (1662–1722)

Chinese soft-paste porcelain

Unlike the European product, Chinese porcelain began with hard-paste, and it is common to regard all Chinese production as hard-paste, [18] until bone china began to be made there in the 20th century. However, a classification of "Chinese soft-paste porcelain" is often recognised by museums and auction-houses, [44] though its existence may be denied by others. [18]

It refers to pieces of Chinese porcelain, mostly from the first half of the 18th century, that are less translucent than most Chinese porcelain and have a rather milky-white glaze, which is prone to crackling. Some regard it as essentially made from a hard-paste body that did not reach a sufficiently high firing temperature, or uses a different glaze formula. It takes underglaze cobalt blue painting especially well, which is one of the factors leading it to be identified as the wares using a mineral ingredient called huashi, mentioned by Father François Xavier d'Entrecolles in his published letters describing Chinese production. [45] It used to be thought that the special ingredient was soapstone (aka "French chalk", a form of steatite; cf. Chinese :滑石; pinyin :huáshí, "talc"), as used in some English porcelain. However, chemical analysis of samples shows no sign of this. [46]

Hard-paste porcelain

Hard-paste porcelain was successfully produced at Meissen in 1708 by Ehrenfried Walther von Tschirnhaus, though Johann Friedrich Böttger who continued his work has often been credited with the discovery of this recipe. As the recipe was kept secret, experiments continued elsewhere, mixing glass materials (fused and ground into a frit) with clay or other substances to give whiteness and a degree of plasticity. Plymouth porcelain, founded in 1748, which moved to Bristol soon after, was the first English factory to make hard-paste. [47]

Notes

  1. "Porcelain plate". Ceramics. Victoria and Albert Museum . Retrieved 6 December 2007.
  2. Edwards, 3-6
  3. Battie, 104; Edwards, 4
  4. Edwards, 1-6
  5. Honey (1977), 4; Rado, P, An Introduction To The Technology Of Pottery, 2nd edition. Pergamon Press, 1988
  6. Honey (1977), 2, 4, 8
  7. 1 2 Battie, 88-102
  8. Honey (1977), 3; Battie, 107-109
  9. Honey (1977), 4-5; see Edwards for the Welsh factories.
  10. Marco Spallanzani, Ceramiche alla Corte dei Medici nel Cinquecento, (Pisa: Scuola Normale Superiore, and Modena: Franco Cosimo Panini, 1994), p. 69.
  11. According to on-site Raman spectroscopic analyses performed at the Musée National de Céramique, Sèvres, reported in Ph. Colomban, V. Milande, H. Lucas, "On-site Raman analysis of Medici porcelain", Journal of Raman Spectroscopy, 35.1 (2003:68-72).
  12. 1 2 Artificial Soft Paste Porcelain - France, Italy, Spain and England Edwin Atlee Barber p.5-6
  13. Honey (1952), p.296
  14. Fournier, p.214
  15. Lane, p.21
  16. Barrett and Thorpe, pp. 60, 141 (141 quoted)
  17. Barrett and Thorpe, pp. 63, 121
  18. 1 2 3 Edwards, 4
  19. Edwards, 4-6
  20. Edwards, 3-4
  21. Hess, Catherine (2003), Italian Ceramics: Catalogue of the J. Paul Getty Museum Collections, pp 230, 237 note 7, 2003, Getty Publications, ISBN   0892366702, 9780892366705, google books
  22. Inorganic Chemistry, by A. F. Holleman, Egon Wiberg, Nils Wiberg, Editor Nils Wiberg, 2001, Academic Press, ISBN, 0123526515, 9780123526519, google books; see also Singer and Singer, pp. 104-1102
  23. Honey (1952), p.496
  24. Honey (1952), p.497
  25. Battie, 102-113
  26. Metropolitan Museum
  27. Honey (1952), p.528
  28. 1 2 Honey (1952), p.533
  29. Metropolitan Museum of Art
  30. Metropolitan Museum of Art
  31. Savage (1983), p.215
  32. Savage, (1983), p.212
  33. All covered by Honey (1977) - see Index or Contents
  34. ‘Science Of Early English Porcelain.’ I.C. Freestone. Sixth Conference and Exhibition of the European Ceramic Society. Vol.1 Brighton, 20–24 June 1999, p.11-17
  35. ‘The Sites Of The Chelsea Porcelain Factory.’ E.Adams. Ceramics (1), 55, 1986.
  36. "Ceramics and Glass Glass". Archived from the original on 3 December 2011. Retrieved 31 October 2011.
  37. "British Museum - Bow porcelain bowl, painted by Thomas Craft". Archived from the original on 4 February 2012. Retrieved 31 October 2011.
  38. 1 2 "Industries: Pottery, Bow porcelain | British History Online".
  39. "Ceramics and Glass Glass St James's (Charles Gouyn)". Archived from the original on 3 December 2011. Retrieved 31 October 2011.
  40. ‘Ceramic Figureheads. Pt. 3. William Littler And The Origins Of Porcelain In Staffordshire.’ Cookson Mon. Bull. Ceram. Ind. (550), 1986.
  41. "Royal Crown Derby". 28 June 2022.
  42. History of Royal Crown Derby Co Ltd, from "British Potters and Potteries Today", publ 1956
  43. 'The Lowestoft Porcelain Factory, and the Chinese Porcelain Made for the European Market during the Eighteenth Century.' L. Solon. The Burlington Magazine. No. 6. Vol.II. August 1906.
  44. example in the Walters Art Museum; example in the Metropolitan Museum; Lot 3205 "A FINE AND RARE DING-TYPE GLAZED SOFT-PASTE VASE, QIANLONG INCISED SIX-CHARACTER SEAL MARK AND OF THE PERIOD (1736-1795)" Christie's, Hong Kong, Sale 3265, Imperial Chinese Porcelain: Treasures from a Distinguished American Collection, 27 November 2013, another example
  45. Valenstein, 242
  46. Savage & Newman, 267-268
  47. Honey (1977), Chapter 14

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References