Raku Kilns

What exactly is a Raku kiln?

A Raku kiln is a specialized type of kiln used primarily for the Raku firing process, a unique method of pottery firing that originated in Japan. Raku firing is known for its fast firing cycle and the dramatic, often unpredictable results it produces, which can include vivid colors and distinctive crackle patterns. Here are some key characteristics and aspects of a Raku kiln and the Raku firing process:

1. Design and Construction: Raku kilns are generally smaller and more lightweight compared to traditional ceramic kilns. They can be constructed from various materials, including metal drums, ceramic fiber, and firebricks. Some Raku kilns are built to be portable, allowing for outdoor firing.

2. Firing Process: The Raku firing process is unique. Pottery is first bisque-fired in a regular kiln, then glazed and subjected to a Raku firing. During the Raku firing, pieces are quickly heated to a high temperature (typically around 1800°F or 1000°C) and then removed from the kiln while they are still glowing hot.

3. Post-Firing Treatment: After removal from the kiln, the pieces are subjected to post-firing reduction. This usually involves placing the hot pottery into containers filled with combustible materials like sawdust, paper, or leaves. The containers are then closed, creating a reduction atmosphere (limited oxygen) which affects the glazes and clay body. This process leads to the distinctive Raku effects, such as crackled glaze surfaces and metallic lusters.

4. Quick Firing Cycle: Unlike traditional kiln firing that can take hours or even days, Raku firing is very fast. The entire process, from heating to cooling, can be completed in a matter of hours.

5. Artistic Effects: Raku pottery is known for its unique aesthetic qualities. The rapid heating and cooling, combined with the reduction process, create varied and unpredictable textures and colors. This unpredictability is a hallmark of Raku pottery and is highly valued by ceramic artists.

6. Use and Functionality: Raku ware is primarily decorative. Due to the nature of the firing process and the low firing temperatures, Raku pottery is generally porous and not watertight. It is not typically used for functional ware that needs to hold liquids or food.

The Raku process is highly valued for its artistic expression rather than for producing functional pottery. It's a favorite among ceramic artists for the unique and often surprising results each firing can bring.

Now, let's find your new Raku kiln!