Wikipedia

Bone china

Bone china is a type of vitreous, translucent pottery,[1] the raw materials for which include bone ash, feldspathic material and kaolin. It has been defined as "ware with a translucent body" containing a minimum of 30% of phosphate derived from calcined animal bone or calcium phosphate.[2] Bone china is amongst the strongest of whiteware ceramics, and is known for its high levels of whiteness and translucency.[3][4] Its high strength allows it to be produced in thinner cross-sections than other types of whiteware.[3] Like stoneware, it is vitrified, but is translucent due to differing mineral properties.[5]

Staffordshire bone china covered chocolate cabinet cup, with enamels and gilding, c. 1815–20, Victoria and Albert Museum.

In the mid-18th century, English potters had not succeeded in making hard-paste porcelain (as made in East Asia and Meissen porcelain), but found bone ash a useful addition to their soft-paste porcelain mixtures. This became standard at the Bow porcelain factory in London (operating from around 1747), and spread to some other English factories. The modern product was developed by the Staffordshire potter Josiah Spode in the early 1790s. Spode included kaolin, so his formula, sometimes called "Staffordshire bone-porcelain", was effectively hard-paste, but stronger, and versions were adopted by all the major English factories by around 1815.[6]

From its initial development and up to the latter part of the 20th century, bone china was almost exclusively an English product, with production being very largely localised in Stoke-on-Trent.[7] Most major English firms made or still make it, including Spode, and Royal Worcester, Royal Crown Derby, Royal Doulton, Wedgwood, and Mintons. In the 20th century it began to be made elsewhere, including in Russia, China, and Japan. China is now the world's largest manufacturer.

In the UK, references to "china" or "porcelain" can refer to bone china, and "English porcelain" has been used as a term for it, both in the UK and around the world.[8]

History

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The first development of what would become known as bone china was made by Thomas Frye at his Bow porcelain factory near Bow in East London in 1748. His factory was located very close to the cattle markets and slaughterhouses of London and Essex, and hence had easy access to animal bones. Frye used up to 45% bone ash in his formulation to create what he called "fine porcelain".[7][9]

 
Plate from Ronald Reagan's state service for the White House, by Lenox.

Later, Josiah Spode in Stoke-on-Trent further developed the concept between 1789 and 1793, introducing his "Stoke China" in 1796. He died suddenly the year later, and his son Josiah Spode II quickly rechristened the ware "bone china".[10] Among his developments was to abandon Frye's procedure of calcining the bone together with some of the other raw body materials, instead calcining just the bone. Bone china quickly proved to be highly popular, leading to its production by other English pottery manufacturers.[11] Both Spode's formulation and his business were successful: his formulation of 6 parts bone ash, 4 parts china stone and 3.5 parts kaolin, remains the basis for all bone china. It was only in 2009 that his company, Spode, went into receivership before eventually being purchased by Portmeirion Pottery.[7][12]

Production

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Main article: Pottery § Production

Raw materials

The traditional formulation for bone china is about 25% kaolin, 25% China stone and 50% bone ash.[13]

The bone ash that is used in bone china has traditionally been made from cattle bones that have a lower iron content. These bones are crushed before being degelatinised and then calcined to around 1,000 °C to produce bone ash.[14] The ash is milled to a fine particle size.[15] The kaolin component of the body is needed to give the unfired body plasticity which allows articles to be shaped.[3] This mixture is then fired at around 1200 °C.[15] The raw materials for bone china are comparatively expensive, and the production is labour-intensive, which is why bone china maintains a luxury status and high pricing.[7]

The use of hydroxyapatite compounds, derived from rock sources, rather than bone ash has seen increased use since the 1990s. If used appropriately the resultant ceramic material conforms to accepted definitions of bone china, and the properties and appearance are indistinguishable from those using naturally derived bone ash.[16][17][18][19]

Mineralogy

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Bone china consists of two crystalline phases, anorthite (CaAl2Si2O8) and β-tricalcium phosphate/whitlockite (Ca3(PO4)2) embedded in a substantial amount of glass.[20]

Production locations

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For almost 200 years from its development bone china was almost exclusively produced in the UK; it was ignored by most European and Asian countries already making porcelain. During the middle part of the 20th century manufacturers in other countries began production, with the first successful ones outside the UK being Japan's Noritake, Nikko and Narumi.[21][22]

Lenox was the only major manufacturer of bone china in the United States,[23] and supplied Presidential dinner service to the White House.[24][25] The factory closed in March 2020.[26]

Production in the Soviet Union started in 1969 at the Lomonosov Porcelain Factory.[27]

In more recent years, production in China has expanded considerably, and the country is now the biggest producer of bone china in the world. Other countries producing considerable amounts of bone china are Bangladesh, India, Indonesia, Sri Lanka and Thailand.[21][22][28]

Rajasthan had become a hub for bone china in India, with production in the state totalling 16-17 tonnes per day in 2003.[29] From the start of the first factory, Bengal Potteries, in 1964, bone china output from Indian factories had risen to 10,000 tonnes per year by 2009.[30]

Cultural issues

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In the 21st century, so called Islamic or halal bone china has been developed using bone ash from halal animals.[31][32]

Due to the use of animal bones in the production of bone china vegetarians and vegans may avoid using or purchasing it.[33] Porcelain manufactured without animal bones is sometimes called vegan porcelain.[34]

References

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  1. ^ Dictionary of Ceramics. A. E. Dodd & D. Murfin. The Institute Of Minerals & Maney Publishing. 1994
  2. ^ By The British Pottery Manufacturers' Federation, and quoted in Dictionary Of Ceramics. Arthur Dodd & David Murfin. 3rd edition. The Institute Of Minerals. 1994-1995.
  3. ^ a b c Ozgundogdu, Feyza Cakir. “Bone China from Turkey” Ceramics Technical; May2005, Issue 20, p29-32.
  4. ^ 'Trading Places.' R.Ware. Asian Ceramics. November,2009, p.35,37-39
  5. ^ What is China? As with stoneware, the body becomes vitrified; which means the body fuses, becomes nonabsorbent, and very strong. Unlike stoneware, china becomes very white and translucent. Archived 2015-06-14 at the Wayback Machine
  6. ^ Honey, W.B., Old English Porcelain: A Handbook for Collectors, p. 4-5, 410-411, 1977, 3rd edn. revised by Franklin A. Barrett, Faber and Faber, ISBN 0571049028
  7. ^ a b c d 'Trading Places.' R.Ware. Asian Ceramics. November,2009, p.35,37-39.
  8. ^ Osborne, Harold (ed), The Oxford Companion to the Decorative Arts, p. 130, 1975, OUP, ISBN 0198661134; Faulkner, Charles H., "The Ramseys at Swan Pond: The Archaeology and History of an East Tennessee Farm, p.96, 2008, Univ. of Tennessee Press, 2008, ISBN 1572336099, 9781572336094; Lawrence, Susan, "Archaeologies of the British: Explorations of Identity in the United Kingdom and Its Colonies 1600-1945", p. 196, 2013, Routledge, ISBN 1136801928, 781136801921
  9. ^ "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
  10. ^ "Spode Museum Trust:The First Spode Period 1776-1833". Archived from the original on 2020-10-11. Retrieved 2014-11-17.
  11. ^ Karwatka, Dennis. "Josiah Spode and His World-Famous Pottery." Tech Directions; Apr 2009, Vol. 68 Issue 9, p12-12.
  12. ^ "Stoke kilns fired up for Spode again". Staffordshire Sentinel. Nortchliffe. 2009-04-24. Retrieved 2009-04-25.
  13. ^ Birks, Steve. “Bone China” The Potteries. 17 Feb. 2003 <http://www.thepotteries.org/types/bonechina.htm>
  14. ^ ‘Production Of Bone Ash For The Manufacture Of Bone China.’ Industrial Ceramics. No.843,1989, p.767-770
  15. ^ a b Whitewares: Production, Testing And Quality Control. W.Ryan & C.Radford. Pergamon Press / Institute Of Ceramics, 1987
  16. ^ 'Skeletons In The Cupboard. Asian Ceramics February 2013
  17. ^ 'Bones Of Contention. Asian Ceramics. April 2004
  18. ^ 'The Case For Synthetic Bone China. Asian Ceramics And Glass, July 2000
  19. ^ 'Replacing Bone Ash In China. D.Gratton. Journal Of The Canadian Ceramics Society 65. No.4. 1996
  20. ^ ‘Pottery Science – materials, process and products.’ Allen Dinsdale. Ellis Horwood. 1986.
  21. ^ a b 'Cup And Sources- Asian Tableware Leads The Way'. Rohan Gunasekera. Asian Ceramics July / August 2013.
  22. ^ a b Skeletons In The Cupboard. Asian Ceramics. February 2013.
  23. ^ "Making Lenox china for the White House".
  24. ^ "About Us".
  25. ^ "China of presidents made in N.C."
  26. ^ Zisko, Allison (2020-04-21). "Lenox CEO Discusses N.C. Factory Shutdown". Home Furnishing News. Retrieved 2020-05-10.
  27. ^ "Костяной фарфор Императорского фарфорового завода" (PDF). Archived from the original (PDF) on 2022-03-15. Retrieved 2022-10-20.
  28. ^ Bangladesh Tableware. Asian Ceramics February 2012.
  29. ^ Bulls In The China Shop. Asian Ceramics. Asian Ceram. February 2003.
  30. ^ Indian Bone China - Serving Up Opportunities. Asian Ceramics. March 2009.
  31. ^ Shirazi, Faegheh, Brand Islam: The Marketing and Commodification of Piety, p. 17, 2016, University of Texas Press, ISBN 1477309462, 9781477309469, google books
  32. ^ The Use of Ceramic Product Derived From Non-ḥalal Animal Bone: Is It Permissible From the Perspective of Islamic Law?. Mohd Mahyeddin Mohd Salleh et al. International Journal of Asian Social Science, 2017, 7(3): 192-198
  33. ^ "Vegetarian Society - Fact Sheet - Veggie Aware A-Z". The Vegetarian Society of the United Kingdom Limited. Retrieved March 21, 2015.
  34. ^ "Noble China tableware is also called vegan porcelain for this reason, because it does not contain any animal components like its bone china counterpart." BHS tableware
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