Raku pottery is a low-temperature firing method where pots come out of the kiln red hot, are handled with long tongs, and are cooled quickly in open air, water or a smoky container. The fast heat shock and the smoke create the crackled, metallic and black-and-white surfaces raku is known for. This guide explains what raku is, how the Japanese and American versions differ, what the classic looks are, and what the honest answer is on food and water use.
Home Pottery HQ is a research site. We did not fire these pots ourselves; we compared glaze maker labels, kiln maker spec sheets and published history sources, listed at the end.
What is raku? The short version
Most pottery cools slowly inside a closed kiln over many hours. Raku breaks that rule. The potter heats glazed bisqueware until the glaze melts, opens the kiln, lifts the glowing pot out, and lets the outside world finish the job.
Three things make a piece "raku" in the modern sense:
- A quick, low firing: Western raku usually fires to roughly 1,470°F to 1,830°F (800°C to 1,000°C), according to standard references. Mayco's raku glazes call for cone 06, which Mayco lists as 1,850°F (1,010°C), with a 5-minute hold.
- Removal while hot: the pot leaves the kiln at full heat, which causes thermal shock and crazing in the glaze.
- Post-firing treatment: air cooling, a water quench, or (most common in the US) a lidded container of combustibles that fills the pot's surface with smoke and carbon.
For a full walkthrough of each stage, see our raku firing guide.
Raku ceramics in Japan: where raku began
Raku ceramics started in 16th-century Kyoto. The tea master Sen no Rikyū worked with a tile maker named Chōjirō to create hand-formed tea bowls for the wabi style of tea ceremony, which valued simple, quiet, imperfect objects. The bowls were shaped by hand, not thrown on a wheel.
The warlord Toyotomi Hideyoshi later gave Chōjirō's son, Jokei, a seal carrying the character "raku," usually translated as enjoyment or ease. The seal became the family name. The Raku family still makes tea bowls today and has passed the name down, sometimes through adoption, to the 16th generation, Raku Kichizaemon XVI.
Traditional Japanese raku is fired at low temperature and is quite porous. It is not the smoky, crackled style most Americans picture. Japanese raku bowls are typically black or red, quiet in color, and meant for the tea ceremony.
American raku and post-firing reduction
The English potter Bernard Leach saw a raku firing at a party in Japan in 1911 and brought the idea west, though interest faded by the 1930s. The method took off in the United States in the late 1950s through the California potter Paul Soldner.
In the 1960s Soldner began placing hot pots into a reduction chamber, a closed container with burnable material. This step is called post-firing reduction. When the hot pot ignites the sawdust or paper and the lid goes on, the fire uses up the oxygen. Smoke and carbon then pull oxygen out of glaze metals (such as copper) and stain bare clay black.
Most raku you see at US craft fairs, community studios and on social media is this American style. When people search "what is raku pottery," this is usually the look they mean, and most raku fired pottery sold in the US today is made this way.
What raku pottery looks like
The same pot can look very different depending on glaze, timing and how much smoke it gets. These are the four looks you will see most often.
Crackle glaze
A white or clear crackle glaze crazes into a web of fine lines when the hot pot meets cool air. In the reduction can, smoke works into those cracks and turns them black. The result is a white surface covered in dark lines. Glaze thickness and the time between kiln and can change the size of the crackle pattern.
Copper matte and metallic flashes
Copper-heavy raku glazes can turn coppery red, purple, blue, green and gold in heavy reduction. AMACO's R-19 Copper Matte, for example, is listed as a low-fire raku glaze for cone 06 to 04, and the dealer listing states that results will vary with every firing. Copper surfaces can also shift color over time as they meet air again, so many potters accept some change as part of the piece.
Horsehair raku
Horsehair raku skips the glaze on most of the pot. Strands of horsehair (or feathers and other fine organics) are laid on the hot, bare burnished clay after it comes out of the kiln. Each strand burns instantly and leaves a thin black or brown line. The pot is not reduced in a can, so the clay keeps its light color around the lines.
Naked raku and smoked clay
Naked raku uses a resist slip and a thin glaze layer over bisqueware. The slip and glaze crack in the firing and reduction, then get peeled or washed off, leaving a smoke-drawn crackle pattern directly on the clay. Bare clay that goes into the reduction can without glaze simply turns gray to deep black, depending on how much smoke reaches it.
How can you tell if a piece of pottery is raku?
There is no single test, but raku fired pottery usually shows several of these signs together:
- Smoke-blackened bare clay. Unglazed areas, especially the foot and base, are gray to deep black from the reduction can rather than the natural clay color.
- Crackle filled with black lines. A white or clear glaze crazed into a web of dark lines is the classic raku look. Ordinary crazing on other ware is usually not stained black.
- Metallic or iridescent copper flashes in red, purple, blue, green or gold, often patchy and different on each side of the pot.
- Thin smoke lines on bare burnished clay, the mark of horsehair or feather raku.
- A light, porous feel and a maker's label that says the piece is decorative, not for food or water.
Some pit-fired and saggar-fired pots share the smoky look, so if a piece matters to you, the most reliable answer is the maker's own description or signature card.
Raku is a cousin of other smoke-based methods such as pit firing. Pit firing is slower and less controlled; raku gives you more say over timing and glaze effects.
Food safety and water: what raku is good for
Raku is best treated as decorative pottery. That is not a legal technicality. It comes from how the ware is made:
- Low firing leaves the clay porous. Reference sources describe a high degree of porosity in raku because of the low firing temperature. Porous clay can soak up liquids and food residue.
- Crackle is a network of open cracks. Crazed glaze lets liquid reach the clay underneath and gives bacteria places to sit. Our glaze crazing guide covers why crazing matters on functional ware.
- Glaze makers label raku glazes as decorative. Mayco states that its raku glazes "are intended for decorative use" and are "not recommended for the food-contact or lip and rim areas of dinnerware due to surface texture and/or chemical durability." Copper and other colorants are also there for looks, not for durability.
Some potters coat raku vases with a sealer or wax so they can hold water for a short time. Results depend on the product, the clay and how thoroughly it is applied. The safer route for flowers is a glass or plastic liner inside the raku vase. For mugs, bowls and plates, use a glaze that its maker labels for food use, fired to the stated cone and tested; see our food-safe glaze guide. So if you are wondering whether you can eat out of raku pottery, the safe answer is no: keep raku for display.
Can you do raku at home?
Yes, many hobby potters do, but it is an outdoor activity with real fire risk. A home raku setup usually needs these things:
- Outdoor space on a noncombustible surface such as concrete, gravel or bare soil, well away from buildings, fences, trees and dry grass.
- A raku kiln, usually a commercial propane kiln with a lifting chamber or hinged sides. Olympic Kilns, for example, sells gas raku kilns and a 120V electric raku model. Our raku kiln guide compares commercial options.
- Propane supply sized to the kiln maker's instructions, with the maker's regulator and hose.
- A metal reduction container with a lid, plus combustibles such as sawdust, newspaper or straw.
- Protective gear: heat-resistant gloves, a face shield, long natural-fiber clothing and a respirator for smoke.
- Permission: local fire code, burn bans, HOA rules and your homeowner's insurance can all limit open flame and smoke in a backyard.
If that list feels like a lot, a community studio "raku day" is a good first step. You glaze your own bisqueware and fire it in the studio's kiln with experienced staff on hand.
The clay matters too, because raku pots must survive sudden heat shock. Our raku clay guide covers which clay bodies work best.
Raku safety basics
Whatever the look, raku firing pottery is hands-on work around open flame, so the safety basics below apply to every firing.
Raku involves open flame, pots near 1,800°F (about 980°C), propane and dense smoke. Wear heat-resistant gloves, a face shield and natural-fiber clothing, keep a fire extinguisher and water within reach, and do the reduction step outdoors. Mayco's raku instructions state that the reduction process should take place outside of buildings because of flames and smoke. Follow your kiln maker's manual and your local fire code.
A few safety points get missed often:
- Electric raku kilns: never reach into an electric kiln with metal tongs while it is powered. Mayco's instructions say not to open or insert tongs into an electric kiln without shutting it off.
- Smoke is not harmless: stand upwind, keep neighbors in mind, and note that a particle respirator does not filter carbon monoxide. Open air and distance are your main protection.
- Glaze dust: many raku glazes carry health caution labels. Mayco marks all but one of its raku glazes as CL (Health Caution) and not suitable for children 12 and under. Mix and apply glaze with gloves, wet-clean spills and never dry sweep.
Common raku mistakes
- Using a dense, tight clay body. Pots crack or blow apart when they meet cool air.
- Expecting the same result twice. Raku is unpredictable by nature; plan a series, not a single perfect pot.
- Leaving the lid off the reduction can too long. Too much air and the copper and crackle effects stay weak.
- Selling raku mugs or bowls as functional. Label raku as decorative unless you have testing that says otherwise.
- Skipping the cleanup. Mayco suggests scrubbing cooled ware with water and a scouring pad, which improves luster and color.
What you need
To try raku at home you need a kiln built for fast firing, long tongs, gloves and a reduction can. Start with our raku kiln guide for commercial gas and electric options, then see our kiln gloves guide for hand protection. If you want a regular studio kiln for bisque firing your pots first, our best kilns for home pottery guide compares the main electric models.
Sources: Wikipedia, Raku ware (history, Raku family lineage, Western firing range and porosity); Mayco raku glaze product information (cone 06 firing, decorative-use statement, CL and AP labels, safety instructions); Seattle Pottery Supply listing for AMACO R-19 Copper Matte (cone 06 to 04); Olympic Kilns raku kiln product pages; Ceramic Arts Network, Tips for Successful Raku Firing (protective gear). Specs checked October 2026.