How to read a Yixing clay name

One word, three different things#

A label such as zhuni can point to three stages that are easy to run together: the ore dug from the ground, the clay body a workshop prepares from one or more ores, and the colour and texture of the fired pot. The Yingge Ceramics Museum describes clay being aged for years before use and fired for about a day at 1150 to 1200 °C. Between the mine and the cup there is grinding, sieving, blending, ageing, forming and firing, and each step changes what the finished pot is.

So when a name appears on a listing, first ask which of the three it is describing. A seller may mean the ore they bought, the body they mixed, or simply the colour you can see. All three are legitimate uses of the word, but they are not the same claim.

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The family under the name zisha#

Zisha is an umbrella. The Yingge Ceramics Museum names four groups under it: purple clay (zini, 紫泥), red clay (hongni, 紅泥), green clay (lüni, 綠泥) and tuanni (團泥), which it describes as a blend of two or more ores. China's national heritage record for the Yixing craft names zini, zhuni and benshan lüni as examples of the raw material. A 2017 series in a national newspaper uses a different split into three types: purple, red and duan clay. Neither scheme is wrong. They show that the grouping depends on who is writing, so a name should be read in the source's own terms.

The heritage record also notes that Yixing pots are generally unglazed inside and out. That is a description of the tradition, not a rule that settles anything about a particular pot.

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Names that describe the fired colour#

Several names are about the result of firing, not about one ore. The 2017 article on red clay calls hongni a collective name for clays that look red, not one specific material, and says that most of the raw ores are in fact yellow or ochre; only a few are red. It places zhuni as the finest red clay and quotes an older book that called the deeper reds zhusha and the paler ones haitang red. The museum, for its part, divides red clay into zihongni and zhuni by mineral type. Read side by side, the two accounts agree that zhuni sits inside the red-clay group, but they draw the line in different ways.

Duanni works the same way. The companion article calls it the modern collective name for clays that fire pale or yellowish, again not one material. Some of its sub-names come from the look of the raw ore, such as sesame duan (芝麻段), and others from the fired colour, such as golden-yellow or rice-yellow duan. The spellings 段, 團 and 緞 are linked by the local pronunciation, as both the museum and the article explain, so a change of character does not signal a different clay.

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Names that describe the ore or the place#

Green clay is named for the raw ore, not the pot: the museum says benshan lüni is scarce and expensive, is mostly used as a surface layer or mixed into purple and red clays, and that few pots are made from it alone. The word benshan (本山, 'this mountain') points to Huanglongshan in Dingshu. The 2017 duanni article notes that benshan duanni was once a catch-all for duan clays from that hill and that the term has narrowed as some of its clays got their own names.

Place names deserve the most care. The museum says the Huanglongshan deposit is now under government control and closed to private mining, and that stocks on the market are said to last for decades. The heritage record calls the raw material scarce and over-exploited. Neither gives figures a buyer could use to check a stated mine or digging date. A lab comparison of three purple-clay samples from Huanglongshan, Zhangzhu and Guangde found similar main oxides and minerals but different grain structures, which a buyer cannot see in a finished pot. A stated origin is therefore the seller's statement until it is documented.

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The colour of the outside can come from a covering. In the Hong Kong catalogue, the upright pot C81.419 takes the shape of a stone stele. Its flat faces carry inscriptions on a pewter casing. In a view of the pot from this angle, those faces tell you about the metalworker’s surface, while the clay beneath is concealed. (宜興紫砂陶器 / Yixing Purple Clay Wares (1994) · C81.419 · no. 43 · p. 88 (PDF 94))

What a name can reasonably suggest#

Clay names do carry some practical information. The museum describes purple clay as plastic, strong and low in shrinkage, which is why it is the main body for most pots. It gives red clays a wide range of shrinkage and zhuni the highest, about 25 per cent, so zhuni is used mostly for small pots. Green clay shrinks 15 to 16 per cent in its account. These are ranges from one source, not measurements of the pot in front of you.

What a name does not tell you is longer: the seam or mine, when the ore was dug, how long it was aged, whether it is one ore or a mix and in what ratio, how hot it was fired, or how it will change a given tea. The 2017 red-clay article also notes that some red-looking pots are made from other clays with added iron-red colourant. That is a reason to ask what the body is, not a test you can do by eye.

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The same word outside Yixing#

Clay words travel. In Chaozhou, the national heritage record for Fengxi hand-thrown pots calls the local clay hongni and calls the product a zhuni pot. The pots are thrown on a wheel rather than built from slabs, and the record's list of about sixty steps includes a glazing step. A Chaozhou zhuni pot is therefore a different tradition with a shared name; see Chaozhou red clay and Chaozhou ware. Do not carry Yixing rules about clay groups, shrinkage or the absence of glaze across to it without a source.

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Older names in a Ming text#

Clay names have changed over time. Zhou Gaoqi's Ming treatise on Yixing pots, 陽羨茗壺系 (1640s), names clays by the hill they came from and the colour they fire to: a sticky 嫩泥 used to bind other clays, a 石黃泥 that fires to a cinnabar colour, a 天青泥 that fires a dark liver colour, with offshoots called pear-skin and pale red, a 老泥 that fires with white sand specks, and a 白泥 used for jars. Zhou also says the earliest pots he knew of were a fine clay of pale ink colour with silvery specks. He does not link any of these to today's names such as zhuni or duanni, so an old name on a modern listing tells you what tradition the seller is invoking, not which material is in the pot.

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Questions to ask about a clay name#

• Does the name describe the ore, the prepared body or the fired colour?
• Is the body one ore or a blend, and if a blend, of what?
• If green clay or another scarce clay is named, is it the whole body, a surface layer or one ingredient?
• What supports a stated mine, seam or digging date? Is there a document, and who issued it?
• Is the pot from Yixing at all, or from another tradition that uses the same word?

A plain answer such as 'a purple-clay blend prepared in our workshop' is more useful than a famous name without detail. The national standard GB/T 10816-2024 covers classification, requirements, testing and labelling of zisha products; its record proves that the standard exists, not that a given pot complies. For checks on the pot itself, see Buying a teapot: checks you can do yourself.

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