Lithophane

A lithophane is a thin piece of porcelain.

It looks like a plain white plate. But a light makes a picture appear. This happens when light shines from behind.

Artists make the clay more thick or thin. The light shows different shades of grey.

People use them for lamps or nightlights. Some show people or pretty trees. You can even see them in teacups.

Today, people use 3D printers to make them. It is a magical way to see art.

A lithophane is a thin piece of porcelain. The name comes from Greek words. It means "stone to cause to appear."

At first, it looks like a plain white plate. The image only shows when light shines from behind.

This happens because the porcelain is different thicknesses. Thicker parts look dark. Thinner parts look light. This creates shades of grey to make a picture.

People invented this in France in the 1820s. A man named Baron Paul de Bourgoing helped make it famous. Soon, many countries made them. Germany became a top maker. They made many for lamps, nightlights, or windows.

To make one, artists carved a wax piece. They used that wax to make a mould. Then they poured porcelain into the mould. Some lithophanes were even painted with soft colors.

Today, people still make them. Some use 3D printing to make new ones. Others use glass or plastic. You can even find them in museums. The Blair Museum of Lithophanes has a very large collection.

A lithophane is a thin plaque made of a see-through material. Most of the time, these are made of porcelain. The name comes from Greek words. "Lithos" means stone and "phainen" means to cause to appear.

At first glance, the plaque might look plain or white. The secret image only appears when light shines from behind it.

This happens because the porcelain has different thicknesses. Thicker areas look like dark shades. Thinner areas let more light through and look light. This creates a picture using different tones of grey. Some later versions even used soft paints to add color.

Making these delicate pieces takes a very careful way of working. First, an artist places a wax plaque on a glass base. They carve the wax to create the image. They check the work by shining light through it. This lets them see if the thickness is right.

Next, they make a mould using plaster of Paris. This mould is then used to shape the porcelain. In the past, makers used metal moulds to make them more durable. The porcelain is often left unglazed, which is called biscuit porcelain. This job is hard because the porcelain is very thin.

People have used similar ideas for a long time. In China, a technique called "an hua" was used. This means "secret" or "hidden" decoration. However, those were mostly floral patterns or religious text. They were often scratched into vases or teapots. The European way of making lithophanes was different. A French diplomat named Baron Paul de Bourgoing patented the method in 1827. He worked with his friend, Baron Alexis du Tremblay. Because the Baron was a diplomat, he did not use his own name for business. Instead, the items were marked "AdT" for Tremblay.

Lithophanes became very popular in the 1800s. Many factories across the world began making them. Germany soon became the main place for production. The Prussian Königliche Porzellan-Manufaktur in Berlin was the largest maker. People even called these "Berlin transparencies."

Other famous makers included Meissen, Volkstedt, and Royal Copenhagen. In England, factories like Minton and Spode made them too. Production was very high between 1840 and 1870. Even after fashion changed, they were made for special events like the Coronation of Edward VII in 1902.

Today, the art of the lithophane is having a revival. We can make them in new ways using modern tools. Some people use 3D printing to create them. Others use glass, plastic, or even paper. You can still find porcelain lithophanes from famous companies like Wedgwood.

Many museums keep these beautiful pieces in their collections. The Blair Museum of Lithophanes in Ohio holds a very large collection. It is a wonderful way to see how light and material work together.

A lithophane is a thin plaque made of a translucent material. Most lithophanes are crafted from porcelain. The term comes from Greek words. "Lithos" means stone. "Phainen" means to cause to appear.

This name describes how the image behaves. At first glance, the plaque may look plain or white. The image only reveals itself when light shines from behind.

This happens through varying thicknesses of the material. Thicker areas block more light and appear as dark shades. Thinner areas allow more light to pass through. This creates a detailed image using different tones of grey, known as grisaille.

The process of making a porcelain lithophane is very precise. An artist begins by placing a wax plaque on a glass backing. They carefully carve the wax to create the image. During this stage, they can shine light through the wax to see the developing picture. This helps them ensure the thickness is correct.

Once the wax is ready, a cast is made using plaster of Paris. This plaster cast becomes a reusable mould for the porcelain. As production increased, makers often used more durable metal moulds instead. The porcelain is generally left unglazed, a state called biscuit porcelain. This work is difficult because the porcelain is often only about 1 mm thick. Because of this thinness, wastage during the firing process was high, reaching up to 60%.

There were earlier precedents for this kind of art. In China, a technique called "an hua" existed. This means "secret" or "hidden" decoration. However, the Chinese method differed from the European one. Artists scratched or engraved designs into unfired porcelain. These were mostly floral patterns or Buddhist text inscriptions. They were usually placed on closed vessels like teapots or vases. This suggests that a backlit view was not the original intention. The European technique was a distinct invention with a different purpose.

The modern European lithophane was invented by Baron Paul de Bourgoing. He was a French diplomat who patented the process in 1827. He worked with his friend, Baron Alexis du Tremblay. The earliest examples were produced at the pottery on Tremblay's estate in Rubelles. Because de Bourgoing was a diplomat, he did not use his own name for commerce. Instead, the lithophanes were marked "AdT" to honor Tremblay. Other factories soon adopted the technique, often using licenses from de Bourgoing. Meissen porcelain began making them in 1829 and produced tens of thousands by 1850.

Lithophanes became a massive global industry during the 19th century. They were used for lampshades, nightlights, or hung in windows. Germany eventually became the world's main producer. The Prussian Königliche Porzellan-Manufaktur (KPM) in Berlin was the largest manufacturer. Their work was so famous that people called them "Berlin transparencies." The Plaue Porzellanmanufaktur in Thuringia was another major producer. They continued making lithophanes into the second half of the 20th century. The peak of production occurred between 1840 and 1870. Other notable makers included Volkstedt, St Petersburg, and Royal Copenhagen.

In England, the technology spread through various licenses. Robert Griffith Jones received an English patent in 1828. He then provided sub-licenses to famous factories. These included Minton, Copelands, and Grainger's Factory in Worcester. While the fashion for lithophanes faded by the end of the 1800s, they remained important for special events. For example, they were made to commemorate the Coronation of Edward VII in 1902. Later, in the mid-20th century, the technique was used in Japan. There, they were often used for teasets for American soldiers after World War II. These sets sometimes featured the face of a geisha at the bottom of the cups.

Today, the art of the lithophane is experiencing a revival. Modern technology allows for new ways to create these images. Some people use 3D printing, which is an additive process. Others use CNC, which is a subtractive process involving digitally-controlled cutting. While traditional porcelain lithophanes are still made by companies like Wedgwood and Bernardaud, new materials are common. Makers now use glass, plastic, and even paper. These modern versions can also include added color. Many museums still hold important collections. The Blair Museum of Lithophanes in Ohio contains the largest collection in the world.