Japanese Porcelain Care: Arita, Hasami, and Kutani
Japanese porcelain — whether it is an Arita teacup, a Hasami dinner plate, or a Kutani sake set — is built to last. Made from high-fired stone clay and finished at temperatures above 1,300°C, properly cared for porcelain can be used daily for decades without losing its color or strength. How you care for a piece, though, depends less on which kiln made it and more on how it is decorated. A plain white teacup and a gold-banded Kutani sake cup come out of the same kiln tradition; they do not belong in the same dishwasher.
This guide walks through what Japanese porcelain actually is, how to identify the decoration on your piece, and the care rules that follow from each technique. The goal is one clear answer to a question most owners never get a straight reply to: can I put this in the dishwasher, and if not, why?
What "Japanese porcelain" means
Japanese porcelain is called jiki (磁器). It is distinct from tōki (陶器, stoneware or earthenware) in three practical ways: jiki is fired hotter (around 1,300°C), the body is vitrified (sealed against water absorption), and the surface, even unglazed, will ring with a clear bell-like tone when tapped. Stoneware bodies are porous and need different care entirely — covered separately in our stoneware vs porcelain identification guide.
Three regions produce the vast majority of Japanese porcelain in daily use:
- Arita-yaki (有田焼) — Saga Prefecture, southern Japan. The most common Japanese porcelain in everyday tableware. White ground with sometsuke (blue-and-white underglaze), iroe (color overglaze), or kakiemon-style designs.
- Hasami-yaki (波佐見焼) — Nagasaki Prefecture, just across the prefectural border from Arita. Most often everyday tableware in plainer designs than Arita.
- Kutani-yaki (九谷焼) — Ishikawa Prefecture, central Japan. The porcelain tradition most associated with vivid overglaze enamel in the five-color (gosai) palette: green, yellow, red, purple, and dark blue.
The takeaway: if you own a piece from Arita, Hasami, or Kutani, the body is technically very durable. What you have to think about is the surface.
Identify your porcelain's decoration before anything else
The single most important question before deciding how to wash a piece is: is the decoration under the glaze, on top of the glaze, or made of gold? The answer determines whether your piece is dishwasher-safe.
Plain white (hakuji 白磁)
Pure white porcelain with no painted decoration, only clear glaze. The body is vitrified and the glaze is glassy and chemically stable. The most forgiving category.
Sometsuke (染付) — blue and white underglaze
Cobalt blue brushwork applied to the bisque-fired body, then covered with clear glaze and fired together at ~1,300°C. Because the cobalt is sealed under the glaze, it does not wear, fade, or scratch off. Most everyday Hasami plates and Arita rice bowls fall in this category.
Iroe (色絵) — overglaze enamel
Colored enamels painted on top of the fired glaze, then fired a second time at 800–1,000°C. The colors are physically thinner and slightly raised — you can sometimes feel them with a fingernail. Iroe is what gives Kutani its characteristic red, green, yellow, and dark blue palette. Because the colors sit on the surface, they are vulnerable to abrasion and to dishwasher detergent over time.
Kinrande (金襴手) — gold brocade / kinsai gold
Gold pigment (or, in some pieces, actual gold leaf) fired onto the glaze surface at low temperature. This is the most decoration-rich, most beautiful, and most fragile finish — and the only finish for which the answer to "microwave or dishwasher?" is a hard no. The reason is physical, not aesthetic: in a microwave, the metal absorbs energy unevenly, sparks, and either ruins the piece or damages the appliance.
Kakiemon and other specific styles
Within these broad categories sit historically defined styles — Kakiemon's milk-white porcelain with sparing iroe enamel, Nabeshima's careful symmetry, and Eiraku-style all-over gold ground. The decoration technique still tells you the care rule.
Daily care, by decoration type
The same quick-reference rule used by traditional craft retailers in Japan applies here:
| Decoration | Hand wash | Dishwasher | Microwave |
|---|---|---|---|
| Plain white / hakuji | Yes | Generally yes | Yes |
| Sometsuke (underglaze blue) | Yes | Generally yes | Yes |
| Iroe (overglaze enamel) | Recommended | Avoid | Usually yes |
| Kinrande / gold | Only | No | No |
Hand-washing is always the safer choice. Use warm water and a soft sponge. A small amount of mild dish soap is fine; avoid abrasive scouring pads and avoid scrubbing across painted lines. Rinse with warm water and dry with a soft cloth or open-air on a rack.
Dishwashers cause cumulative damage to overglaze enamel through three mechanisms: high water temperature, alkaline detergent that slowly etches the surface, and the spray-arm hitting pieces against each other. None of these will destroy a single wash; all of them will dull a kinrande pattern over a year of daily use.
About microwaves and gold: Gold pigment, kinsai overglaze, and any silver or metallic finish should never go in a microwave. The metal will arc — visible as a small spark — and can damage both the piece and the microwave. This applies even when the metal looks like a thin painted line. If you cannot tell whether the decoration contains metal, hand-warm the piece instead.
First use of a new piece
Porcelain is vitrified and waterproof, so the kanmasu (米のとぎ汁) rice-water seasoning step used for unglazed stoneware and earthenware is not needed. The first-use routine for porcelain is much simpler:
- Rinse the piece with warm water on both sides. This removes any residual kiln dust.
- Wash gently with a soft sponge and mild dish soap.
- Rinse and dry. The piece is ready to use.
Some porcelain styles — particularly older Kutani and some kakiemon-style pieces — show fine surface crazing in the glaze, called kannyū (貫入). This is a normal aesthetic feature of the firing process, not damage, and it does not affect food safety. Pieces with deep crazing are best hand-washed regardless of decoration.
Five common mistakes to avoid
- Thermal shock. Pouring boiling water into a cold porcelain piece, or moving a piece directly from a freezer to a hot oven, can crack even a heavy plate. Let pieces come to room temperature first.
- Metal scrubbers and abrasive pads. These will scratch glaze and will strip overglaze enamel and gold. Use a soft sponge.
- Long soaks for gold pieces. Kinrande and kinsai overglaze do not enjoy prolonged contact with water or detergent. Wash, rinse, dry — do not leave in a sink overnight.
- Stacking heavy pieces directly. Glaze-on-glaze stacking, especially under weight, causes hairline scratches over time. Place a paper towel or thin felt between stacked plates.
- Citrus and acidic detergents on overglaze. Lemon-based dish detergents and descaling chemicals will etch overglaze enamel. Switch to a plain mild soap for iroe and kinrande pieces.
Storage and stacking
Porcelain stored daily on an open shelf needs nothing more than the precautions above. For heirloom pieces — especially gold-decorated Kutani, Kakiemon-style Arita, and any piece you do not use weekly — these steps extend useful life by years:
- Place an unbleached paper sheet (or a thin cotton cloth) between stacked plates and inside nested bowls.
- Store gold-decorated pieces separately from plain pieces — gold can transfer faint marks onto adjacent surfaces under weight.
- Keep pieces away from direct sunlight if displayed; UV does not damage glaze but will fade enamels and lighter pigments over years.
- Pieces that arrived in a paulownia wooden box (kiribako, 桐箱) are best stored in that box. Paulownia is the traditional wood for ceramic storage because it buffers humidity.
If a piece chips or develops a crack, the traditional Japanese repair tradition is kintsugi — gold-mended repair using urushi lacquer. Detailed coverage in our guide to kintsugi.
FAQ
Is Japanese porcelain dishwasher-safe?
Plain white and sometsuke (underglaze blue) porcelain is generally dishwasher-safe in a gentle cycle. Iroe (overglaze enamel) is technically dishwasher-safe but the decoration dulls over time, so hand-washing is recommended. Kinrande and any gold-decorated porcelain should always be hand-washed.
Why can't gold-decorated porcelain go in the microwave?
Gold and other metallic pigments fired onto porcelain absorb microwave energy unevenly. The result is electrical arcing — visible sparks — that can damage the decoration, the piece, and the microwave itself. The rule applies even to thin gold lines you might mistake for paint.
How do I know if my piece is overglaze or underglaze decoration?
Run a fingernail lightly across the decorated area. If you can feel the edge of the color slightly raised, it is overglaze enamel (iroe). If the surface is uniformly smooth and the color appears under a glassy layer, it is underglaze. Gold decoration is always overglaze and is recognizable by its metallic sheen.
Do I need to season a new porcelain bowl before using it?
No. Porcelain is vitrified — fully sealed by high-temperature firing — and does not need the rice-water (kanmasu) seasoning step required for unglazed earthenware and stoneware. A rinse with warm water and a gentle wash with mild soap is all a new piece needs.
What does kannyū (crazing) mean — is my piece broken?
Kannyū (貫入) is a fine network of surface lines in the glaze, caused by the glaze contracting at a different rate than the body during cooling. It is a normal aesthetic feature of many Japanese porcelains and stonewares, not damage. Pieces with kannyū are food-safe but are better hand-washed than dishwashed.
How is porcelain care different from stoneware or urushi care?
Porcelain is vitrified (sealed) and most decorations tolerate dishwashers. Stoneware is porous and needs different rules. Urushi lacquerware is a cured organic polymer that is heat-sensitive and never tolerates dishwasher or microwave — see our urushi lacquerware care guide.
Editor's note: ZenKiln works directly with kilns and distributors across Arita, Hasami, Ishikawa, and other Japanese pottery regions, and ships hand-packed from our Sengoku studio in Tokyo. All ZenKiln porcelain ships with care recommendations specific to the piece's decoration.