Raku vs Hagi vs Karatsu: How to Tell Them Apart

Raku, Hagi and Karatsu are told apart by three things: how the bowl was formed, what colour the clay is where it is bare, and what the glaze does over years of use. Shape is the least reliable guide of all, because all three kilns make similar shapes.

The quickest of those is forming. Raku is the only one of the three not thrown on a wheel, so a single turn of the bowl in the hands settles most cases before any glaze is considered.

What "Ichi Raku, Ni Hagi, San Karatsu" Does and Does Not Say

The three kilns arrive already ordered by an old phrase — 一楽二萩三唐津, ichi Raku, ni Hagi, san Karatsu. It is a traditional expression of how tea people ranked these wares as tea bowls: how far each was preferred, and how well suited each was thought to be to the practice. It is not a ranking of price or of artistic worth, and it has no single official reading.

The reasons usually given for Raku's place at the head are partly historical and partly practical. Historically, the Raku bowl is bound up with Rikyū and the development of wabi-cha more closely than any other ware. Practically, a low-fired, thick-walled, hand-formed bowl holds heat without passing it to the fingers, its surface is soft against the whisk, and it sits gently in the hand. Those characteristics are widely acknowledged; how much weight each carries in the ordering is a matter of interpretation rather than settled fact.

What the phrase certainly is not is a price list. Plenty of Karatsu is worth more than plenty of Raku — an old Karatsu bowl of quality can stand far above an ordinary Raku one, and among living potters the same reversal is common. Reading the phrase as a market ranking is one of the more frequent ways collectors go wrong early.

The three names are not even the same kind of name. Hagi and Karatsu are places. Raku is a family — one Kyoto house, fifteen generations deep, whose history is set out in Raku: 15 Generations of Fire. That is why a Raku bowl can carry a single impressed character where the other two more often carry nothing at all.

The Three Side by Side

	Raku 楽	Hagi 萩	Karatsu 唐津
Where	Kyoto	Yamaguchi	Saga / Nagasaki (Kyushu)
Formed	By hand, then carved. No wheel	Thrown	Thrown
Bare clay	Warm buff to dark, smooth	Pale — white, cream, faintly pink	Sandy and coarse — tan through grey-brown, often iron-flecked
Glaze	Thick monochrome: black or red	Milky loquat-white straw ash, heavy crazing	Thin and varied — iron-painted, mottled white, or two glazes running together
Foot	Carved, tool marks, often a small ridge inside	Frequently cut with a notch (warikodai)	Neatly trimmed, sandy to the touch
In the hand	Light, warm, insulating	Light, porous	Denser, harder, cooler
Sound when tapped	Dull. No ring	Low, soft	Higher, closer to a ring
Changes with use	Surface softens and darkens slowly	Markedly — tea enters the crazing and the colour shifts	Little; stain settles into the crazing only

How to Work Through a Bowl

1. Look for throwing rings first. Run a fingertip up the inside wall. Concentric ridges mean a wheel, which rules out Raku immediately. Raku is built by hand and cut to shape, so its walls vary and its interior has no regular spiral.
2. Turn it over and look at the colour of the bare clay. This separates Hagi from Karatsu faster than any glaze detail. Hagi's body is pale and smooth — white through cream to a faint pink. Karatsu's is coarse and visibly sandy, running from tan to grey-brown, often with dark iron specks. The texture separates them even when the colours come close: Hagi's foot is fine, Karatsu's is gritty.
3. Check whether the foot ring is cut. A notch through the foot — warikodai — is strongly associated with Hagi and is one of the few marks that points to a single kiln from across a room. One traditional explanation says it was cut deliberately so that ordinary people could use wares otherwise reserved for feudal presentation; others point to removal from the kiln, to protecting the foot from chipping, or simply to taste. Historians have reached no consensus, and for identification the fact of the notch matters more than the story behind it.
4. Read the glaze surface. Raku is a thick single colour, black or red, sitting like a skin. Hagi is milky and crazed all over, the crazing usually stained. Karatsu is thinner and more varied — an iron-brushed design, an opaque mottled white, or a dark and a pale glaze meeting and running.
5. Weigh it and feel the temperature. Raku is noticeably light for its size and stays comfortable in the hand when full. Karatsu is the heaviest and coolest of the three. Hagi sits between, closer to Raku.
6. If handling is permitted, a very light tap may offer one more clue. Raku usually gives a short, muted response — low firing leaves the body open — while denser Karatsu often rings longer. Firing, thickness, size, clay, glaze and any hidden crack all change the sound, so it is never decisive on its own. Treat it as supporting evidence, never as the primary test, and never tap a bowl that is not yours to handle.
7. Look for a seal, then discount it. Raku bowls in the main line carry an impressed 楽; Hagi and Karatsu are more often unsigned or signed on the box. A seal narrows the field, but a seal is also the easiest thing to copy — the clay and the forming are not. How signatures and boxes are read is set out in How to Read a Raku Tea Bowl.

Where They Get Confused

The usual mix-up is not between the three kilns but between Hagi and everything else pale. Many kilns make a whitish, crazed, straw-ash-glazed bowl, and a bowl is not Hagi because it is white and crackled. Go to the clay at the foot: Hagi's pale body is the constraint, not the glaze over it.

Hagi also changes more than collectors expect. Tea works through the crazing over years and the colour shifts — the effect is known as hagi no nanabake, the seven transformations of Hagi. A bowl used for a decade does not look like the same bowl unused, which means a heavily changed Hagi can read as a different kiln entirely to someone who has only seen new ones.

Karatsu is the widest category of the three and the one where a single description does least work. Iron-painted e-garatsu, mottled madara-garatsu, and chōsen-garatsu with two glazes running into each other look almost unrelated to one another. The sandy, iron-flecked body is what they share.

None of this establishes age. A bowl can be unmistakably Hagi and have been made last year — separating old from recent is a different set of checks, set out in How to Tell if a Japanese Tea Bowl Is Antique or a Modern Reproduction.

Each kiln is listed separately: Raku, Hagi, Karatsu.