Stoneware gets its name from its stone-like qualities. You can find it today in common household items like beer steins, crocks and coffee mugs. What sets stoneware apart from other pottery like porcelain or earthenware though? There are several factors that define stoneware and set it apart from other types of pottery.

What is the Difference between Ceramics and Pottery?

Pottery only uses clay. However, ceramics can have clay and other minerals that fortify it. These fortifications come in the form of glazes, mineral additives and other ingredients in the clay body that will make it more durable. Ceramics can also use minerals that aren’t clay, like zirconium oxide or plaster.

Because pottery consists of only clay, it is porous and not watertight. It’s also more fragile than ceramics, because there are no other minerals or glazes to fortify the mug. On the other hand, its fragility makes it perfect for etching intricate designs.

Cultures from all over the worlds have prized pottery for this reason for centuries, from ancient Greece to the Ashanti Empire and medieval Japan.

Today, most potters start out with more basic pottery before mastering ceramics. This allows them to develop their own methods and styles of working the clay on the pottery wheel before incorporating other minerals or additives.

Differences between Earthenware, Stoneware and Porcelain

Even though all three types of pottery begin with clay, the processes potters use to make them can differ widely. Here are a few of those key differences in a nutshell.

Earthenware

Potters have fired earthenware in ovens for thousands of years. During the height of the Roman Empire, it was used as amphorae to transport wine and olive oil to the farthest corners of their territory. But, liquids could penetrate these vessels, so goods like oil would often go rancid with repeat or prolonged use.

Unlike stoneware and porcelain, it only needs firing temperatures of 1,200° F or lower. To make it watertight, some potters who work with earthenware glaze their products. However, due to the lower firing temperature, you can still scratch and damage it with a knife. Today, most bricks used in buildings are earthenware, along with terracotta pots for plants and other housewares.

Earthenware is a popular choice for beginner potters. Part of the reason why it’s so popular is because earthenware clay is generally easier for potters to work and is more forgiving. However, it’s also less versatile and more fragile than other types of pottery.

Stoneware

Stoneware appeared after earthenware. It requires higher firing temperatures than earthenware. In most cases, our crew fires our stoneware at temperatures ranging from 2,000° to 2,400° F—hotter than lava from a volcano. Those high temperatures turn the glazes on the outside of the stoneware to glass, or vitrify it.

Unlike porcelain, which is almost always white, potters can make stoneware with multiple different clay colors today. We even combine multiple clay colors into some of our stoneware for a truly unique twist.

Stoneware pottery is strong, hard and nonporous. It’s durable, elegant and versatile; capable of being anything from a customized trophy to a baking dish. In our case, it can also stand up to the heat from a microwave, dishwasher or even an oven under the right conditions. Stoneware also distributes and retains heat more evenly than other types of pottery, so it’s perfect for drinking coffee or tea.

Porcelain

Porcelain was the last type of pottery to reach the west, finally growing in popularity in Europe and North America during the 1700s. On the other hand, it was prized in China even longer for its durability and strength.

Back in the day, potters fired porcelain at even higher temperatures than stoneware. Typically, the final firing temperature ran around 2,600° F.

Today though, the only true difference between how potters make porcelain and stoneware is that porcelain almost always uses white clay. Although it often includes the white mineral kaolin, almost any white clay or even bone ash can do the trick. However, this kaolin is harder for potters to work with and less forgiving than other types of clay. It’s also more fragile in this day and age.

Sculptors can also mold porcelain into more delicate shapes than earthenware or stoneware. Since the 18th century, collectors have prized porcelain because of that, using it to imitate everything from the flowing mane of a horse to the folds of fabric on a dress. With the development of new technology and ideas though, the differences between porcelain and stoneware are becoming fewer and fewer for modern potters.

How is Stoneware Made?

Although stoneware has existed for thousands of years, technology has enabled potters to make it faster and more easily than ever before. There are three main methods for creating stoneware today. These are molding, slipcasting and handcrafting.

Molding

For stoneware, molding is the act of inserting clay into a mold before firing it. Manufacturers use similar processes to produce goods like plastics at scale.

To create mugs, steins and other stoneware products with this process, manufacturers make a mold with hollow portion in the shape of the final product. A liquid slurry of clay and water, called slip, pours into the hole and hardens around the edge of the mold. After the outer edge of the slurry is solid, the liquid interior comes out. Then, the potters remove the mug from the mold. It then dries and goes into the kiln.

Molding is a common way to mass-produce pottery. It’s a cheap, easy method to produce thousands of uniform products. Factories can also use molds to print on designs with a heat press or other printing equipment. However, one of the biggest complaints with molded stoneware is that it’s fragile. Printed designs on these mugs also tend to fade away with time, after years of use and cycles in the dishwasher.

Slipcasting

Slipcasting involves pouring liquid clay into a mold and letting it form a cast inside. Unlike other methods of creating pottery, slipcasting allows for more intricate shapes that potters can’t mass-produce on a pottery wheel. Once the clay is in the mold, it hardens and forms a hollow cast until it can keep its shape. This can take hours to complete, depending on weather conditions. After the piece is dry, makers can glaze it and fire it in the kiln.

While slipcasting allows for shapes that aren’t easily handmade, this type of pottery is fragile. It breaks easily and doesn’t withstand high temperatures, so it’s not always safe to use in the dishwasher, microwave or oven.

Wheel throwing

In spite of the advent of molds and slipcasting, many potters still choose to create stoneware on pottery wheels. Artisans have been doing this for thousands of years. The main mechanism for this method is always the potter’s hands, which better guarantees quality. However, potters can operate their wheels with several different methods, including electric-run or manual wheels, depending on their preferences.

The term “wheel throwing” comes from the start of the process, when the potter literally throws a lump of clay onto the pottery wheel. The potter then centers the clay in the middle of the wheel and forms it, using water and their wet hands to form the clay into the desired shape.

Once the potter shapes the clay, they cut it from the pottery wheel with a thin metal wire. Soon after, the mug, stein or bowl gets a handle or other embellishments to improve its strength.

What are Ceramic Glazes?

Glazes are any combination of minerals and chemicals that change the color of ceramic pottery. Most potters dip their smallest pieces directly into the glaze. For larger pieces like vases or large bowls though, they might spray or pour the glaze onto it.

Ceramic glazes impart beauty and strength. The glazes used on stoneware almost exclusively come from minerals. During the last firing cycle, the glazes melt and fuse with the mug, so it becomes a thin layer of glass.

There are potentially millions of different recipes for ceramic glazes. Some ceramicists work with glazes that have a rainbow-like luster, while others can be matte or glossy. They can also come from artificial chemicals or from natural minerals. All of our glazes come from mines across the U.S. Some glazes can also contain minerals like lead or cadmium. Just Grace Ceramics glazes do not.

Like colors in a painting, glazes can impart a different mood or make a statement on each ceramic piece. Solid glazes can run from rustic and understated to vintage or chic. Then there are two- and three-color glazes, which serve to make the piece look even more beautiful while showing a touch of class or patriotism in subtle detail.

Ceramic glazes can change texture and color. In some cases, even the slightest change in the kiln temperature or ratio of minerals can make the colors drastically different. We have our team of mad scientists to the test every once in a while, and the final results we like the most become our newest glaze colors.

What is the history of stoneware?

Stoneware dates back thousands of years. Some of the earliest pieces of it come from the Indus Valley Civilization in 1900 BCE, in what is now India, Pakistan and Afghanistan. Other early examples come from the Shang dynasty, which ruled China from 1600 BC–1046 BC. They glazed and fired stoneware in kilns and used it to store food, liquids and spices. Even earlier possible examples of stoneware have come from archaeological sites in China dating back to the Paleolithic era, more than 10,000 years ago.

The first examples of stoneware in the United States came from Great Britain and Germany during the colonial era in the late 1600s. The earliest production of stoneware in America began around 1720 in Philadelphia; Yorktown, Virginia; and New York City. These producers used glazes to decorate stoneware, along with designs to mark the contents or manufacturer. Stoneware jars and crocks were essentials until the advent of the modern refrigerator, since they resisted liquid and kept their contents cool all year long. They were also essential for storing preserved food and extending its shelf life through the winter months.

For centuries, potters specializing in stoneware have tried to experiment and improve their craft. Some, such as Doyle Lane, changed the game with glazes you could feel in their pottery. Others, like Adelaide Robineau, changed the way potters painted and glazed their work. George Ohr was another innovative potter who inspires Sunset Hill Stoneware even today.

A self-styled mad potter who lived in Biloxi, Miss., Ohr became famous after his death in 1918 for his highly unusual stoneware pots. His “mud babies,” as he called them, had extremely thin, warped walls and metallic glaze colors. While few potters even today have been able to recreate his ultra-thin walls, his metallic glazes still inspire our work in colors.

Years after his passing, Ohr’s work was rediscovered gathering dust in the back of a garage in Mississippi. It’s now on display in the Ohr-O’Keefe Museum of Art in his hometown of Biloxi. Art historians also now revere him as the father of abstract-expressionism in America. Even more, he continues to inspire us to leave our mark on the art world in our own way.

The pottery world is full of innovators like Ohr. Dozens of potters have left their mark on how they make stoneware for years to come. Stoneware is an art form that doesn’t typically get as much publicity today as other types of pottery. However, potters still enjoy working with it to this day.

How is stoneware used today?

Stoneware is still a household item even today. Mold-formed stoneware is a popular choice for plates and dinnerware in retail shops. It’s also a classic choice for chafing dishes, crocks and other pieces you can use in cooking.

Because Just Grace Ceramics Stoneware products are safe in the microwave, oven and dishwasher, they’re perfect for cooking everything from omelets in a mug to French onion soup. Because our stoneware retains heat well, it’s also the most elegant choice you can make for having your coffee in the morning.

On the other hand, stoneware is also good at keeping beverages cold. Why do so many choose our stoneware? Because it keeps the liquid from warming to room temperature faster than traditional liquid glasses and is a statement piece few can forget. While it’s not always a good idea to put your stoneware mugs in the freezer, they can still keep your favorite drinks ice cold longer.

Stoneware is also the favorite material for bakers across the world. Because it distributes heat evenly in the oven, stoneware baking stones and jelly roll pans are perfect for baking everything from bread to pizzas in style without bringing a cheap metal sheet into the mix.

Unlike other, more fragile drinkware, our Just Grace Ceramics stoneware mugs do not chip easily and can handle years of daily use, making them excellent gifts. Legend in our office even tells of a customer whose mugs survived a fire at their business. This stoneware can potentially last a lifetime, and is guaranteed to add a touch of class to your mug collection.

Conclusion

The pottery world is full of innovators who continue to experiment with their craft. Some, like George Ohr, have even left their mark on the art form and inspired others to follow in their footsteps. While other types of pottery may get more publicity today, stoneware continues to be a popular choice among potters because of its unique properties. We hope you've enjoyed this look into the history and process behind making stoneware pottery!