Yixing Clay Labels Compared: Zini, Zhuni, and Duan Ni
A cautious comparison of three common Yixing clay labels, what each name can tell you, and what it cannot prove.
Zini, zhuni and duanni are common Yixing clay labels. They describe broad material categories, not a reliable ranking of quality or fixed tea pairings.
| Label | Chinese | Usual appearance |
|---|---|---|
| Zini | 紫泥 | Brown, red-brown or purple-brown |
| Zhuni | 朱泥 | Red or orange-red |
| Duan ni | 段泥 | Buff, tan, yellow or greenish tones |
Appearance is only a starting description. Clay preparation, blending, additions and firing can all affect colour.
Zini
The name means “purple clay,” though finished pots often look brown. It is a broad category. A small thin zini pot and a large thick one may handle heat very differently.
Zhuni
“Vermilion clay” is associated with red bodies, fine surfaces and a reputation for difficult firing. The label alone does not establish rarity, old stock or an unmixed body. Ask the seller what they mean by it and what supports that description.
Duan ni
Duan ni is commonly used for lighter bodies. The archive glossary describes it as a light-coloured, fine-textured Yixing clay, but current market usage is broad. A pale surface does not prove higher porosity. It may simply show tea stains more readily.
Compare the finished pots
Ask the same questions of all three: what is known about the clay preparation and blend, how was the pot formed, and what are its practical capacity and weight?
For brewing, compare a familiar tea with the same water, leaf ratio and temperature. Count infusion time through the end of the pour, and taste blind if possible. Repeat before deciding whether the difference matters to you. This comparison tests the pots’ performance; it does not identify their clay.
Check the opening, handle, filter and lid too. The Shuiping and Four-Sided Angular Pot records show concrete differences to inspect.
If you are buying your first pot, start with the first-pot guide. Material and forming method are separate questions.
Archive note
The local 紫音希声 database records 紫砂 across several sections of the book, 段泥 on pages 107 to 185, and 朱砂 on pages 365 to 459. These are working index ranges, not a laboratory classification. The source OCR and English translations still require comparison with the Chinese page image.
Quick answers
Frequently asked questions
What is the difference between zini, zhuni and duanni?
Zini is a broad purple-clay label commonly associated with brown or purple-brown pots; zhuni is associated with red or orange-red bodies; duanni is commonly used for lighter buff, tan or yellow bodies. The labels do not fully specify composition, firing, porosity or brewing performance.
Which Yixing clay is best for Pu-erh tea?
No clay label is universally best for Pu-erh. Capacity, wall thickness, opening, pour speed and the finished pot's actual thermal behaviour may matter more than whether a seller calls it zini, zhuni or duanni. Compare pots with the same tea before dedicating one.
Is zhuni more valuable than zini?
The word zhuni does not by itself prove rarity, purity, old stock or value. Price should reflect the documented material, maker, forming method, firing quality and finished pot—not the red colour or label alone.
Can you identify Yixing clay by colour?
Colour is a useful observation but weak authentication evidence. Firing, atmosphere, processing, blends and added colourants can change the finished appearance, so a photograph or colour name cannot establish the clay source or composition.