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Earthenware

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Earthenware is a type of nonvitreous pottery that is either glazed or unglazed.

Red terracotta flowerpots
Red terracotta flowerpots

It is defined by being fired at relatively low temperatures. Unlike porcelain or stoneware, earthenware does not undergo vitrification, which is the process of turning into a glass-like substance. This means the finished body remains porous and can absorb liquids like water. Because of this, most modern domestic earthenware is coated with a ceramic glaze to make it watertight.

Tea served in Kulhar in India
Tea served in Kulhar in India

This material has been essential for making tableware, decorative figurines, and building materials for thousands of years.

Creating earthenware begins with selecting specific clays and minerals. A common contemporary formulation includes 25% kaolin, 25% ball clay, 35% quartz, and 15% feldspar. These materials provide high plasticity, which makes the clay easier to shape. Artists can use a potter's wheel, a roller-head, or a RAM press to form the object.

Red terracotta flowerpots
Red terracotta flowerpots

Once shaped, the piece is fired in a kiln. Modern production often involves two stages. First, it may undergo a biscuit firing between 900°C and 1050°C. Then, it may undergo a glost firing, or glaze firing, between 1000°C and 1150°C. The atmosphere in the kiln also affects the final color. Firing in an oxidising atmosphere often results in red colors for iron-rich bodies. Conversely, a reducing atmosphere can produce darker colors like black.

Earthenware can be categorized by its appearance and use. Terracotta is a common type of dark, reddish-orange earthenware. This color comes from a high content of iron oxides in the clay. It is widely used for flower pots, tiles, and oven ware. Other types include majolica, which is a type of tin-glazed pottery. There is also lusterware, which features iridescent glazes, and Raku. Some materials, like ironstone china, exist on the border between earthenware and stoneware. These distinctions depend on the clay composition and the temperature of the firing.

History shows that earthenware was the primary form of pottery for much of human existence. Pit-fired earthenware dates back as far as 29,000–25,000 BC. For millennia, it was the only type of pottery being produced. Significant historical traditions include the pottery of Egypt, Persia, and the Near East. Ancient Greek and Roman cultures relied heavily on earthenware for their vessels. In East Asia, porcelain was not manufactured at scale until the 18th century AD. Before that time, earthenware was the standard for most ceramic needs across the globe.

The significance of earthenware is seen in its massive scale of use. It comprises nearly all European pottery produced up to the seventeenth century. It also includes most building bricks used in construction. In the 18th century, technical improvements in England allowed for the creation of fine wares. Wedgwood produced creamware, which was so high in quality it successfully competed with porcelain. This was demonstrated by his massive Frog Service created for Catherine the Great. Later, the invention of transfer printing made decorated earthenware affordable for many more people.

Many highly complex and artistic examples of earthenware exist. The Yixian glazed pottery luohans from the Liao dynasty are life-size figures.

Flickr - dalbera - Statue de l'Arhat Tamrabhadra (musée Guimet)
Flickr - dalbera - Statue de l'Arhat Tamrabhadra (musée Guimet)

Another remarkable example is the Saint-Porchaire ware from the mid-16th century.

Salt MET LC-17 190 1744-006
Salt MET LC-17 190 1744-006

In the 1860s, Mintons created life-size majolica peacocks that are considered highly important.

These pieces show how earthenware can reach incredible levels of detail and beauty.

Earthenware also played a major role in the history of indoor sanitation. During the 19th century, glazed earthenware was the primary material for early indoor flush toilets.

Ad 1884 twyford
Ad 1884 twyford

Manufacturers like Twyford and Doulton produced these fixtures. They often used a "cane and white" finish to ensure durability. This meant the exterior stayed a natural buff color while the interior had a white glaze. This white glaze was necessary to keep the bowls hygienic. However, earthenware had technical weaknesses for this job. The body could chip easily, and the porous nature could eventually absorb moisture and odors. This led to a later shift toward more dense materials like vitreous china.

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🖼️ Images & Media (6)
File:Tea served in Kulhar in India.jpg
Tea served in Kulhar in India.jpg
File:Red terracotta flowerpots.jpg
Red terracotta flowerpots.jpg
File:Flickr - dalbera - Statue de l'Arhat Tamrabhadra (musée Guimet).jpg
Flickr - dalbera - Statue de l'Arhat...
File:Salt MET LC-17 190 1744-006.jpg
Salt MET LC-17 190 1744-006.jpg
File:Minton lead-glaze majolica peacock, circa 1870, coloured lead glazes. Naturalistic in style. Potteries Museum, Stoke-on-Trent, UK.jpg
Minton lead-glaze majolica peacock, circa...
File:Ad 1884 twyford.jpg
Ad 1884 twyford.jpg
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