Collecting and authenticating teaware

Editors · October 25, 2026 · 10 min read

An inscription on the base proves nothing: you date a piece by its body, glaze, foot and shape. Maker seals are the easiest thing to fake, and prices follow the name, provenance and paperwork.

Attribution answers three questions: when a piece was made, by whom or in which kiln, and whether the inscription is real. For teaware this is not an academic exercise. Age does nothing for the taste of the tea, but it sets the price, and old or named pieces cost tens of times more than new work.

What is written on the base

A reign mark (年款) is written or stamped on the base, less often on the foot, body or rim. The six-character formula has the dynasty (大明, 大清), the reign title (成化, 康熙) and 年製, “made in the years of.” The four-character form drops the dynasty, and sometimes 御, “by imperial command,” replaces 年. Marks appear in regular script or archaic seal script, under or over the glaze, in columns of two or three characters read right to left. There are also hall marks, personal names and auspicious wishes.

Reading the mark is only the start. Catalogs and reference atlases distinguish six cases:

• mark and period: the piece was made in the reign it names;
• apocryphal mark: a later piece with the title of a revered earlier reign, most often Chenghua on Kangxi wares;
• later imitation: a copy of an old type together with its mark, something the imperial kilns themselves did under Yongzheng and Qianlong;
• popular-kiln mark: an imperial formula on minyao goods, “of the period” but not imperial;
• modern fake, or a mark added to an old unmarked piece;
• unresolved: not enough evidence.

Auction houses have their own wording. At Christie’s, “…mark and of the period” means the house believes the piece was made in the reign of the mark. “Probably of the period” is less sure, and “possibly” signals serious doubt. If the mark is named but the period is not, the house does not vouch for the date.

Two myths are worth clearing up. The 1677 ban on reign titles on Jingdezhen porcelain came from the county magistrate Zhang Qizhong, not from the Kangxi emperor; it was local and unevenly enforced. Nor is a red iron overglaze mark a sign of a fake, since imperial kilns used it too, more often from the mid-Qing. A worn mark does not prove age either. An underglaze mark cannot be rubbed off; only the glaze above it wears.

The order of inspection

Judge the object, and check the inscription last. A practical order:

1. Copy the characters and note position, hand, frame and method of application.
2. Compare the writing with documented marks of the claimed reign: brush, stroke forms, pigment.
3. Check body, glaze, foot, shape and decoration separately against securely dated pieces (for porcelain, see Jingdezhen).
4. For a Yixing pot, look separately at clay and firing, shape, building technique and inscriptions.
5. Examine a porcelain cup for cracks: a hairline shows against the light, or as a line that darkens once the cup holds water. A crack through the base can leak.
6. For an important piece, leave the final call to a specialist who has handled it in person.

Yixing pots: shape, strainer, seal

Inscriptions on Yixing teapots include dates, hall names, wishes, poems and personal names. Ming ones are incised in regular script, early Qing pots mix regular and seal script, and later seal script dominates. The maker did not always cut the inscription himself. Shi Dabin only began to “write with the blade” after he became famous, and Li Maolin, according to the Yangxian Ming Hu Xi, merely added a cinnabar mark.

Shape is a better guide than the inscription, because it sets the earliest possible date. The Mansheng types (箬笠, 瓢提, 井栏) cannot be earlier than the Jiaqing era, “Fish Turned Dragon” cannot be earlier than Shao Daheng, and “Pan Hu” cannot be earlier than Daoguang. A “duohui” pot with a large lid in the manner of Cheng Shouzhen dates from the twentieth century.

More dating clues:

• The spout strainer. Until the late Qing there is a single hole; very large pots have several holes or a coin-shaped strainer. Mid-sized pots get a mesh in the late Qing and early Republic. The hemispherical “ball” strainer dates from the 1970s and was made for the Japanese market.
• Volume. According to the Yixing Taoci Tupu, late Ming “Mengchen” pots are rarely under 140 ml, and a pot under 60 ml is usually late Qing or later.
• The base. Early Qing potters did not smooth the inside of the base with a bamboo knife; the practice begins after Jiaqing and Daoguang.

The oldest piece with an absolute date is a pot about 18 cm tall from the Nanjing tomb of the eunuch Wu Jing. The land deed for the grave is dated 1533, and Wu Jing himself died in 1544, so the burial was no earlier than 1533 and, by several sources, around 1544. As for the most famous names, Hui Mengchen and Hui Yigong, experts say not a single reference piece by either has been scientifically confirmed. The masters of Yixing covers who they were and how fashions in shape changed.

Fakes and their tells

A seal is the easiest thing to fake. The Smithsonian’s National Museum of Asian Art holds a plum-blossom teapot with a false Shi Dabin signature and dates it to the nineteenth century or, more likely, the 1920s to 1930s.¹ Makers’ seals also go on pots made by hired workers (代工), and other people’s seals are forged outright. A Xiamen seller in 2014 put fakes at 90% of the market, but that is an opinion, not a statistic.

The most common tricks:

• Artificial ageing. A fake baojiang comes off with a fingernail or boiling water; a real one holds. Inside a fake the deposit is solid black, while on a genuine pot it is thin, uneven, grayish white and yellow-brown. Chinese sellers say the “old” pots on street stalls are aged with shoe polish.
• Impossible color. Dark green clay comes from adding cobalt oxide, so a “Ming” or “Qing” pot of that color is suspect.
• Mass-produced ware sold as handmade. These pots are turned on a wheel from ordinary clay with colorants; one worker makes 200 to 300 a day, and they sell for 10 to 30 yuan. Concentric wheel marks show inside. A genuine Yixing body is beaten out of a slab or assembled from slabs, not turned.
• An early mark on a late object, and an imperial formula on popular-kiln goods.

No single check replaces the others. A false mark on a genuine old body is as common as a genuine mark on a copy.

Titles, paperwork, prices

Titles for Yixing makers come in two kinds, and people often confuse them. The honorary titles are Master of Chinese Arts and Crafts (中国工艺美术大师), Master of Chinese Ceramic Art, and the Jiangsu provincial master and “celebrity” titles. The professional grades are five steps, from assistant craftsman to the research-level senior grade. By 2017 Yixing had a hundred or more holders of honorary titles and over six thousand with grades. Across seven competitions from 1979 to 2018, 533 people received the title Master of China. Commercial sites disagree on the requirements for the top grades, and the official rules could not be checked.

A title raises the price but does not guarantee the master shaped that particular pot. This is why provenance matters in China: a catalog, an exhibition, an earlier auction lot. The prices below are reference points, not a price list:

• A pot by an apprentice or ordinary maker: 200–300 yuan; a named master from 1,000 yuan. Clay accounts for no more than 10% of that.
• Chen Mingyuan, “pumpkin” teapot: HK$8.42 million (Christie’s, June 1, 2011).
• Shi Dabin: 13.44 million yuan (Xiling, autumn 2010).
• Gu Jingzhou, set of 11 pieces: 17.825 million yuan (Poly, 2011).
• The Chenghua “chicken cup”: HK$281.24 million (Sotheby’s, Hong Kong, April 8, 2014); the same cup sold for HK$29.17 million in 1999.

A new pot can also be checked against a national standard. GB/T 10816-2024 took effect on July 1, 2025 and replaced the 2008 edition. Under it, teapots must be built by hand, beaten out or assembled from slabs, absorb no more than 6% water, and survive a transfer from 180°C into 20°C water.² The standard says nothing about authenticity, and it dropped the limits for lead and cadmium release. For safety, see Is your teaware safe?.

Japanese boxes: hakogaki

In Japan the document is the box. The maker’s hakogaki inscription (箱書き) and a box signed by the maker (tomobako, 共箱) count almost as much in an appraisal as the object. Antique dealers advise keeping the box and the seals on the base and under the lid of a kyusu, and not scrubbing off tea deposit with detergent, since to them it is a mark of age. Taiwanese collectors, by contrast, often bleach old pots and “raise” them again with tea. Opinions remain divided.

In sencha circles, collectors prize above all karamono (唐物), Chinese imports, and Tokoname kyusu with a signed box. Rough figures from buyers: an unnamed modern Yixing pot, from a few thousand to several tens of thousands of yen; a Qing master, from 300,000 to several million; a kyusu by Yamada Jozan III with its box, 100,000–500,000. Jozan was recognized in 1998 as a holder of important intangible cultural property for Tokoname-yaki (kyusu).

Where to look and how to keep it

Reference collections are open to the public. The Museum of Teaware in Flagstaff House, Hong Kong, built on the gift of K.S. Lo (about 600 pieces, half of them Yixing), opened in January 1984. The Palace Museum in Beijing holds about 400 pieces of zisha. The National Palace Museum in Taipei has 21 enameled Yixing pieces with a Kangxi mark. The China National Tea Museum in Hangzhou opened in April 1991.

Rinse old porcelain with hot water after tea and let it dry. A mild cleaner is fine for deposit, but keep these pieces out of the dishwasher and do not bleach tea-stained crackle. Warm a cup before the first pour and pour boiling water gently. A cup with a hairline crack is better kept for cooler teas. More on cleaning and storing teaware.

Qing gongfu cups often cost less than a new studio cup, and they serve just as well as a new one of the same thickness and shape.