Jianzhan Tea Cups: Hare's Fur, Oil Spot and the Song Dynasty Tea Bowl

Jianzhan (建盏) are dark tea bowls and cups made from iron-rich clay and glaze at the Jian kilns in northern Fujian. They were prized in the Song dynasty, when tea was powdered and whisked into a white foam: the dark glaze made the foam easy to judge. Firing produces patterns such as hare's fur (fine streaks), partridge feather and oil spot. In Japan these bowls became known as tenmoku, and three rare yohen tenmoku bowls are national treasures there. Today jianzhan cups are popular for darker teas like red tea, pu-erh and roasted oolong.

I'll be honest: I bought my first jianzhan cup for its looks. A small hare's fur cup with streaks like a brown feather, at a pottery stall. I didn't expect it to be practical. It turned out to be my favourite cup for shou pu-erh and Wuyi oolong: thick, warm in the hand, and the dark glaze catches the light in the tea. For light green tea it's useless, and that's fine.

More in the teaware guide.

A short history#

In the Tang dynasty, tea was boiled, and Lu Yu praised greenish celadon bowls for showing off its colour. In the Song dynasty, the fashion changed: tea was ground to powder and whisked into a white foam, and tea contests judged the whiteness of the foam and how long it lasted. Dark Jian bowls made white foam stand out best, and they became the bowls of choice, from monasteries to the imperial court.

The traditional account is that Japanese monks brought these bowls home from Mount Tianmu in China, which is why Japan calls them tenmoku. Three yohen tenmoku bowls, with iridescent spots like a starry sky, are designated national treasures in Japan.

When loose-leaf tea took over in the Ming dynasty, small white porcelain cups replaced dark bowls. Jianzhan production faded for centuries and was revived in modern times.

Glaze patterns#

The patterns come from iron in the glaze reacting during a very hot firing; no two cups are the same.

Which teas suit a jianzhan cup?#

For delicate teas, use thin white porcelain instead: see Chinese tea cups.

How to choose a jianzhan cup#

• Weight and feel: heavy, thick-walled and comfortable in the hand.
• Glaze: even, with no pinholes or cracks inside where tea could collect.
• The foot: Jian clay is dark, often purplish or iron-black. A pale or white foot suggests it isn't Jian clay.
• Pattern: choose what you like; hare's fur is the classic.
• Be sceptical of "antique" claims. Most jianzhan sold today is modern, and that's perfectly fine.

Care#

• Rinse with warm water after use; avoid harsh detergents that dull the glaze.
• Avoid thermal shock: don't pour boiling water into a very cold cup.
• Dry it well, especially the unglazed foot.

My side-by-side#

The same shou pu-erh in a thin white porcelain cup and a hare's fur jianzhan.

Porcelain: the tea looked ruby red and cooled quickly; bright and clear.

Jianzhan: the tea looked almost black with a copper edge, stayed hot longer, and felt rounder and softer.

For shou, I prefer the jianzhan every time.

Myths#

"Jianzhan improves any tea." It flatters dark teas and hides pale ones.

"Jianzhan releases minerals that change the taste." Its effect comes from shape, thickness and heat, not magic.

"Every hare's fur cup is antique." Most are modern revival pieces.

My honest take#

One good jianzhan cup is a lovely companion for pu-erh and roasted oolong, and it brings a thousand years of tea history to your table. Just don't pour your Longjing into it.

The bottom line#

Jianzhan are dark iron-glazed cups from Fujian's Jian kilns, famous since the Song dynasty for hare's fur, oil spot and other patterns, and known in Japan as tenmoku. Use them for dark, warming teas; keep white porcelain for delicate ones. More in my Chinese tea cups guide and teaware guide.

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