Teaware and water

一From Lu Yu's kit to the gaiwan#

Teaware belongs to a preparation and a setting. Lu Yu’s Chajing separates tools for manufacturing tea from the vessels for boiling and serving it. Its drinking kit includes a brazier, cauldron, grinder, sieve, water filter, bowls and cleaning equipment. The familiar total of twenty-four depends on how components are counted. His preference for Yue celadon concerns the appearance of his liquor in that bowl. See Tea classics for the chapter structure and the limits of treating his prescription as all Tang practice.

Song authors describe a different preparation in the bowl. Cai Xiang’s Chalu prefers a dark, thick Jian bowl for a pale surface and sustained warmth, and a heavy spoon for mixing. Huizong’s Daguan chalun discusses a bamboo whisk and successive additions of water. The Jian bowl is therefore a functional object as well as a collected ceramic. Many Chinese black-glazed bowls reached Japan; tenmoku is a Japanese designation whose scope should not be equated with one Chinese kiln.

For the gaiwan, distinguish earlier cups with stands or covers from the familiar lidded bowl and saucer used for tea. Hong Kong’s Museum of Tea Ware describes its three-piece form as a Kangxi-period creation and holds an early-nineteenth-century example; Taiwan’s National Palace Museum emphasizes its widespread Qing use. These institutional accounts do not support confidently dismissing a Qing origin on the basis of a superficially similar earlier vessel. Establishing an exact first example would require a separate study of form and use.

A gaiwan can be a drinking vessel, with the lid holding leaves aside, or a brewing vessel from which liquor is poured into cups. Modern gongfu practice often uses the second function. An old object with a lid is not automatically evidence for that modern use.

二Yixing: a short history#

Zhou Gaoqi’s late-Ming 陽羨茗壺系 is a foundational account of Yixing teapot makers. It tells how an unnamed Jinsha Temple monk prepared clay and how zisha pot-making was associated with Gongchun, then evaluates later makers including Shi Dabin. Read these as Zhou’s transmitted accounts and judgments. They are not contemporary workshop records of every origin episode.

Archaeology provides a different kind of evidence. A Palace Museum scholarly discussion of the pot from Wu Jing’s tomb distinguishes the tomb’s preparation in 1533 from his death and burial in 1544. The latter supplies the burial context; it does not identify the potter or give the exact year of manufacture. This is more informative than repeating a bare “first teapot” date. Earlier kiln-origin claims need the excavated material and its dating argument, rather than a smooth line from a Song kiln to every later Yixing form.

Xu Cishu’s Chashu discusses Gongchun and Shi Dabin but is critical of aspects of sand-clay pots. A famous maker’s reputation did not mean every writer agreed about the best material for brewing. Later literati collaborations joined potting, poetry, calligraphy and seals. When reading a museum label, distinguish an attributed maker, a signature on the object, and a secure archaeological or documentary provenance.

Shape names such as shipiao, Xishi and duoqiu help recognize families of form. They do not by themselves authenticate age or authorship. Compare the wall, lid fit, handle, spout and pouring function before treating a seal or a romantic origin story as proof.

三What zisha is made of#

Zisha names a family of Yixing ceramic materials, not a single purple substance. The Yingge Ceramics Museum’s account distinguishes purple, red, green and mixed clay bodies, explaining that they differ in working properties and shrinkage. Clay names can refer to raw material, preparation or a customary appearance after firing; a retail name alone is not a chemical specification.

Keep three stages separate: mined material, the body prepared by the potter, and the fired object. Crushing, sieving, ageing the prepared clay, mixing materials and firing all intervene between mine and pot. Museum descriptions of mixed bodies show why “blended” cannot automatically mean counterfeit. Conversely, a natural-sounding clay name does not prove a particular mine origin.

Colour is an observation, not an assay. The cited analyses of particular purple-clay samples are measurements of those samples; they cannot turn the colour of an unknown finished pot into an iron percentage. Do not transfer one specimen’s Fe2O3 result to every zhuni or duanni pot. Precise claims about additives or deposits require documentation or relevant testing.

GB/T 10816-2024, Zisha ware, was issued on 31 December 2024 and took effect on 1 July 2025, replacing the 2008 edition. The official catalog verifies that status. A product-standard citation is not a certificate that a particular pot came from Huanglongshan, was entirely handmade or was made by the person whose seal appears on it. For a useful purchase record, retain the maker’s identity, declared material, dimensions, capacity and the evidence supplied for those claims.

四The Chaozhou gongfu set#

The Chaozhou gongfu set organizes four jobs: heating, boiling water, brewing and drinking. The National Palace Museum describes the familiar four treasures as a stove, the side-handled water kettle, a Mengchen-type small pot and Ruoshen cups. Its displayed sets are explicitly described as assembled combinations; objects grouped in a modern display should not automatically be read as an intact historical owner’s set.

Mengchen pots and Ruochen or Ruoshen cups carry famous names in the tea trade. The name on a class of wares is not sufficient evidence that one historical potter made every example. For preparation, the distinctions are practical: the kettle supplies water, the pot extracts tea, and cups distribute it. A water kettle and a brewing pot should not be collapsed into one generic “teapot” in translation.

Chaozhou gongfu tea entered the national intangible-heritage list in 2008 as project 1014, Ⅹ-107. The project description presents a twenty-two-step sequence. That is a documented formulation of the practice, not evidence that every household has always followed an identical performance. Hong Kong’s December 2024 inventory includes 潮州工夫茶藝 as item 5.104 and emphasizes etiquette, mutual consideration and community identity.

Read the set with the social activity: who heats the water, who serves, how strength is shared and how guests receive a cup. Objects preserve these relationships as well as craft skill. See Regional styles for regional connections.

五Porcelain, other clays and iron#

Plain white glazed porcelain provides a useful visual background for comparing liquor and is common in evaluation. A vessel’s size, wall thickness, preheating and pour still affect preparation; material alone does not guarantee identical brewing. Dehua in Fujian made porcelain from the Song and expanded after the Ming; its ivory-white ware went to Europe as "China white", and its craft was on the first national heritage list in 2006.

Other Chinese potteries make unglazed teaware too. Jianshui purple pottery 建水紫陶 from Yunnan is thrown, carved, inlaid with coloured clay and polished without glaze, a technique dating to the Daoguang reign and listed in 2008. Qinzhou Nixing pottery in Guangxi, known for colour changes in the kiln, was listed the same year.

Cast-iron kettles 铁壶 came into Chinese tea rooms from Japan: Nanbu kettle-making in Morioka began in 1659, and Chinese demand grew sharply after 2011. Hong Kong’s Museum of Tea Ware was established in 1984. K. S. Lo’s 1981 gift of about 600 ceramics, zisha wares and related objects formed its collection’s foundation. Its holdings allow comparison of materials and functions across periods; an object’s catalog entry remains more precise evidence than a generic story about “Chinese teaware”.

六Water in the classics#

Lu Yu ranked water by source: mountain water first, river water second, well water last, and among mountain waters slow springs and stone pools rather than rushing falls or stagnant pools. He described three stages of boiling 三沸, from "fish eyes" to rolling waves, added salt at the first, and called water boiled past the third too old. Judging the boil, houtang 候汤, became a skill of its own; Cai Xiang found it the hardest part, and preferred a small ewer because the water is easier to judge.

Ranking springs became a genre. Zhang Youxin's 《煎茶水记》, of the early 9th century, records two lists: seven waters attributed to Liu Bochu, headed by the Nanling water of the Yangzi, then the Huishan Temple spring at Wuxi and Huqiu at Suzhou; and twenty waters attributed to Lu Yu, headed by a spring on Mount Lu, with Huishan second and snow water last. Zhang also transmits a story in which Lu Yu identifies water taken from the bank rather than the claimed Nanling source. This is a literary anecdote, not a demonstrated experiment; the Palace Museum notes that Ouyang Xiu later challenged inconsistencies in Zhang’s water accounts. Huizong wanted water that was clear, light, sweet and clean. A Beijing tradition says the Qianlong emperor weighed spring waters in a silver measure and named the lightest, the Jade Spring, the first under heaven.

The Ming author Xu Cishu summed up the idea that fine tea holds its fragrance and water releases it. The authors do not offer one identical ranking. Lu Yu ranks river water above well water, while Huizong rejects river water in his discussion and allows a frequently drawn well. Read the comparisons in their texts rather than treating them as modern water testing. Tea classics separates Lu Yu’s own prescriptions from later stories attributed to him.

七What modern chemistry adds#

Water affects both extraction from the leaf and the stability of compounds already in the cup. In Cabrera and colleagues’ green-tea experiment, brewing at 70 °C for 3 minutes with synthetic waters of 21–338 ppm hardness as calcium-carbonate equivalents gave 164.6 versus 67.5 mg total catechins per 235 ml cup at the two extremes. The authors attributed the decline mainly to autoxidation of EGC and EGCG, promoted by alkaline conditions; it is not simply a measure of how much left the leaf. Caffeine fell from 27.7 to 19.9 mg in the Lipton sample, but the other tested brands did not show that decrease. Infusion pH ranged from 6.0 to 7.1. These are results for the tested teas and water recipes, not a universal pH threshold or a ranking of every drinking water.

Water can change measured compounds and preference in different ways. In Bai and colleagues’ green-tea experiment, volatile content peaked at calcium 30 mg/l and pH 6.5 among the tested conditions, then fell at pH 7.5. This is not a universal flavour target. In the cited white-tea experiment, purified water scored best; in Franks and colleagues’ green-tea test, consumers preferred the harder tap water. More extraction does not automatically mean a better cup.

For your own comparison, make fresh brews of a familiar tea with different drinking waters. Keep the vessel, dry-leaf mass, added water, temperature setting and timing consistent. Compare aroma and taste as well as colour. These studies do not establish one ideal hardness, pH or mineral content for every tea, or show that purified water necessarily tastes flat.