Free to follow every thread. No paywall, no dead ends.
Porcelain: the story on HearLore | HearLore
Porcelain
Porcelain is not merely a type of pottery; it is a material that has captivated human imagination for centuries, transforming from a humble clay mixture into a substance so prized it was once called white gold. The very name porcelain derives from the Italian word porcellana, meaning cowrie shell, a reference to the smooth, lustrous surface of the shell that early European traders associated with the delicate, translucent wares they first encountered from China. This material, created by heating kaolinite and other raw materials to temperatures exceeding 1,200 degrees Celsius, possesses a unique combination of strength, whiteness, and translucency that sets it apart from all other ceramics. Unlike earthenware or stoneware, which remain porous and opaque, porcelain becomes completely vitrified, meaning it is impermeable to liquids even before glazing, and resonant when struck. The journey of porcelain from its origins in ancient China to its status as a global commodity and industrial necessity is a story of scientific discovery, imperial ambition, and the relentless pursuit of perfection.
The Chinese Invention
The story of porcelain begins in China, where potters spent centuries refining their craft to achieve what they called high-fired ware. The earliest proto-porcelain wares date back to the Shang dynasty, between 1600 and 1046 BCE, but it was not until the Eastern Han dynasty, from 25 to 220 CE, that these wares evolved into true porcelain with the required whiteness and translucency. By the late Sui dynasty, spanning 581 to 618 CE, and the early Tang dynasty, from 618 to 907 CE, the standards for porcelain had been fully established, with famous types like Ding ware achieving the desired qualities. The production of porcelain became highly organized during the Song dynasty, which lasted from 960 to 1279 CE, with dragon kilns capable of firing as many as 25,000 pieces at a time, and later over 100,000 by the end of the period. The city of Jingdezhen emerged as the undisputed center of Chinese porcelain production, originally owned by the imperial government and later becoming a source of immense pride for the Ming dynasty, which ruled from 1368 to 1644 CE. The Yongle emperor, who reigned from 1402 to 1424 CE, even erected a white porcelain brick-faced pagoda at Nanjing, showcasing the exceptional smoothness of the glaze peculiar to his reign. By the time of the Qing dynasty, which began in 1644 CE, Jingdezzen porcelain had reached the peak of its fame, with blue-and-white wares becoming coveted exports to Asia, Africa, and Europe via the Silk Road. Portuguese merchants began direct trade with the Ming dynasty in 1517, followed by Dutch merchants in 1598, spreading the demand for Chinese porcelain across the globe.
The name porcelain derives from the Italian word porcellana, meaning cowrie shell, which refers to the smooth, lustrous surface of the shell that early European traders associated with the delicate, translucent wares they first encountered from China.
When was true porcelain first created in China?
True porcelain with the required whiteness and translucency first evolved during the Eastern Han dynasty, which lasted from 25 to 220 CE, although proto-porcelain wares date back to the Shang dynasty between 1600 and 1046 BCE.
Who produced the first hard white translucent European porcelain?
Ehrenfried Walther von Tschirnhaus produced the first hard, white, translucent specimen of European porcelain in 1708 using kaolin and alabaster mined from a Saxon mine in Colditz.
When was the Meissen porcelain factory established?
The Meissen factory was established in 1710, producing porcelain that was once-fired and noted for its great resistance to thermal shock.
What is the composition of dental porcelain?
A formulation of dental porcelain contains 70 to 85 percent feldspar, 12 to 25 percent quartz, 3 to 5 percent kaolin, up to 15 percent glass, and around 1 percent colorants.
When did Japanese porcelain production begin?
Japanese porcelain production began after the arrival of Korean potters that were taken captive during the Japanese invasions of Korea from 1592 to 1598, who brought an improved type of kiln and spotted a source of porcelain clay near Arita.
For centuries, the secrets of porcelain manufacture were closely guarded by the Chinese, but the European quest to replicate the material began in earnest during the 16th century. Portuguese traders returned home with samples of kaolin, the essential ingredient, yet the techniques and composition remained a mystery. Countless experiments failed, producing unpredictable results. The breakthrough finally came in the German state of Saxony in 1708, when Ehrenfried Walther von Tschirnhaus produced a hard, white, translucent specimen using kaolin and alabaster mined from a Saxon mine in Colditz. This discovery was a closely guarded trade secret of the Saxon enterprise. Tschirnhaus, a man of wide scientific knowledge, was joined by Johann Friedrich Böttger, a former pharmacist turned alchemist who had claimed to know the secret of transmuting dross into gold. Imprisoned by Augustus II, King of Poland and Elector of Saxony, Böttger was forced to work with other alchemists in a futile search for transmutation before being assigned to assist Tschirnhaus. The first specimen of hard, white, and vitrified European porcelain was produced in 1708, but Tschirnhaus died in October of that year, leaving Böttger to report to Augustus in March 1709 that he could make porcelain. The Meissen factory was established in 1710, producing porcelain that was once-fired and noted for its great resistance to thermal shock, with a visitor reportedly seeing a white-hot teapot dropped into cold water without damage. In 1712, the French Jesuit father François Xavier d'Entrecolles revealed the elaborate Chinese manufacturing secrets throughout Europe, publishing them in the Lettres édifiantes et curieuses de Chine, which allowed the secrets to be used in Europe.
The Soft Paste Struggle
While hard-paste porcelain was being perfected in Germany, European potters were also experimenting with soft-paste porcelain, a material that did not require the high firing temperatures of hard-paste but was more difficult to control. Soft-paste porcelains date back to early attempts by European potters to replicate Chinese porcelain by using mixtures of clay and frit, with soapstone and lime included in some compositions. These wares were not yet actual porcelain, as they were neither hard nor vitrified by firing kaolin clay at high temperatures. Early formulations suffered from high pyroplastic deformation, or slumping in the kiln at high temperatures, making them uneconomic to produce and of low quality. In France, experiments at Rouen produced the earliest soft-paste, but the first important French soft-paste porcelain was made at the Saint-Cloud factory before 1702. Soft-paste factories were established with the Chantilly manufactory in 1730 and at Mennecy in 1750. The Vincennes porcelain factory was established in 1740, moving to larger premises at Sèvres in 1756. Vincennes soft-paste was whiter and freer of imperfections than any of its French rivals, putting Vincennes/Sèvres porcelain in the leading position in France and throughout Europe in the second half of the 18th century. In England, the first soft-paste was demonstrated by Thomas Briand to the Royal Society in 1742, believed to be based on the Saint-Cloud formula. In 1749, Thomas Frye took out a patent on a porcelain containing bone ash, which was the first bone china, subsequently perfected by Josiah Spode. The great success of English ceramics in the 18th century was based on soft-paste porcelain and refined earthenwares such as creamware, which could compete with porcelain and had devastated the faience industries of France and other continental countries by the end of the century.
The Bone China Revolution
Although originally developed in England in 1748 to compete with imported porcelain, bone china is now made worldwide, including in China. The English had read the letters of Jesuit missionary François Xavier d'Entrecolles, which described Chinese porcelain manufacturing secrets in detail. One writer has speculated that a misunderstanding of the text could possibly have been responsible for the first attempts to use bone-ash as an ingredient in English porcelain, although this is not supported by modern researchers and historians. Traditionally, English bone china was made from two parts of bone ash, one part of kaolin, and one part of china stone, although the latter has been replaced by feldspars from non-UK sources. The English had read the letters of Jesuit missionary François Xavier d'Entrecolles, which described Chinese porcelain manufacturing secrets in detail. One writer has speculated that a misunderstanding of the text could possibly have been responsible for the first attempts to use bone-ash as an ingredient in English porcelain, although this is not supported by modern researchers and historians. 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 took out a patent on a porcelain containing bone ash. This was the first bone china, subsequently perfected by Josiah Spode. William Cookworthy discovered deposits of kaolin in Cornwall, and his factory at Plymouth, established in 1768, used kaolin and china stone to make hard-paste porcelain with a body composition similar to that of the Chinese porcelains of the early 18th century. But the great success of English ceramics in the 18th century was based on soft-paste porcelain, and refined earthenwares such as creamware, which could compete with porcelain, and had devastated the faience industries of France and other continental countries by the end of the century. Most English porcelain from the late 18th century to the present is bone china.
The Industrial Canvas
Beyond its decorative and tableware applications, porcelain has found critical roles in technology and industry, serving as a material of immense durability and resistance. Porcelain has been used for electrical insulators since at least 1878, with another source reporting earlier use of porcelain insulators on the telegraph line between Frankfurt and Berlin. It is widely used for insulators in electrical power transmission systems due to its high stability of electrical, mechanical, and thermal properties even in harsh environments. A body for electrical porcelain typically contains varying proportions of ball clay, kaolin, feldspar, quartz, calcined alumina, and calcined bauxite. In 2018, a porcelain bushing insulator manufactured by NGK in Handa, Aichi Prefecture, Japan was certified as the world's largest ceramic structure by Guinness World Records, standing 11.3 meters in height and 1.5 meters in diameter. Chemical porcelain, characterized by low thermal expansion, high mechanical strength, and high chemical resistance, is used for laboratory ware such as reaction vessels, combustion boats, evaporating dishes, and Büchner funnels. Porcelain tiles have been defined as ceramic mosaic tiles or pavers that are generally made by the dust-pressed method, resulting in a tile that is dense, fine-grained, and smooth with sharply formed face, usually impervious and having colors of the porcelain type which are usually of a clear, luminous type or granular blend thereof. Historic examples of rooms decorated entirely in porcelain tiles can be found in several palaces including ones at Galleria Sabauda in Turin, Museo di Doccia in Sesto Fiorentino, Museo di Capodimonte in Naples, the Royal Palace of Madrid, and the nearby Royal Palace of Aranjuez, as well as the Porcelain Tower of Nanjing. More recent examples include the Dakin Building in Brisbane, California, and the Gulf Building in Houston, Texas, which when constructed in 1929 had a porcelain logo on its exterior. Because of its durability, lack of rusting, and impermeability, glazed porcelain has been in use for personal hygiene since at least the third quarter of the 17th century, with porcelain chamber pots commonly found in higher-class European households, and the term bourdaloue used as the name for the pot. Dental porcelain is used for crowns, bridges, and veneers, with a formulation of dental porcelain being 70-85% feldspar, 12-25% quartz, 3-5% kaolin, up to 15% glass, and around 1% colorants.
The Global Tapestry
Porcelain's influence spread far beyond China and Europe, reaching Japan, Korea, and eventually the rest of the world. Although the Japanese elite were keen importers of Chinese porcelain from early on, they were not able to make their own until the arrival of Korean potters that were taken captive during the Japanese invasions of Korea from 1592 to 1598. They brought an improved type of kiln, and one of them spotted a source of porcelain clay near Arita, and before long several kilns had started in the region. At first their wares were similar to the cheaper and cruder Chinese porcelains with underglaze blue decoration that were already widely sold in Japan, this style was to continue for cheaper everyday wares until the 20th century. Exports to Europe began around 1660, through the Chinese and the Dutch East India Company, the only Europeans allowed a trading presence. Chinese exports had been seriously disrupted by civil wars as the Ming dynasty fell apart, and the Japanese exports increased rapidly to fill the gap. At first the wares used European shapes and mostly Chinese decoration, as the Chinese had done, but gradually original Japanese styles developed. Nabeshima ware was produced in kilns owned by the families of feudal lords, and were decorated in the Japanese tradition, much of it related to textile design. This was not initially exported, but used for gifts to other aristocratic families. Imari ware and Kakiemon are broad terms for styles of export porcelain with overglaze enamelled decoration begun in the early period, both with many sub-types. A great range of styles and manufacturing centers were in use by the start of the 19th century, and as Japan opened to trade in the second half, exports expanded hugely and quality generally declined. Much traditional porcelain continues to replicate older methods of production and styles, and there are several modern industrial manufacturers. By the early 1900s, Filipino porcelain artisans working in Japanese porcelain centers for much of their lives, later on introduced the craft into the native population in the Philippines, although oral literature from Cebu in the central Philippines have noted that porcelain were already being produced by the natives locally during the time of Cebu's early rulers, prior to the arrival of colonizers in the 16th century. Korean porcelain, with its olive green glaze introduced in the late Silla Dynasty, and its inlay technique of expressing pigmented patterns by filling the hollow parts of pottery with white and red clay, became a distinctive style, with most specimens having inlay decoration under the glaze. Most Korean ceramics from the Joseon Dynasty are of excellent decorative quality, usually having a melon shape and being asymmetrical.