Oil Spot vs Hare's Fur vs Partridge Feather: Which Jian Zhan Glaze Should You Collect?

Short answer: oil spot, hare's fur and partridge feather are three crystal formations of the same iron glaze, created in the same 1300°C reduction firing — and there is no single 'best' pattern, only the one that speaks to you. Each has its own rarity, character and collecting story.

Three Patterns, One Chemistry

All Jian Zhan patterns begin with the same raw material: a glaze rich in iron oxide, fired in a reduction atmosphere where oxygen is starved. Whether iron precipitates into round droplets, vertical streaks or feather-like patches depends on temperature, timing and the glaze's viscosity at the moment of cooling. The potter sets the stage; the kiln writes the pattern. See the full glaze atlas →

Oil Spot (You Di): The Collector's Star

Oil spots are round metallic droplets — silver, gold or blue — that appear to float just beneath the surface. They demand a very narrow temperature window, which is why flawless oil spots remain the most sought-after pattern in modern collecting. In strong light the spots shift and shimmer, which is why photographers love them: our guide to photographing the glaze explains how to capture that depth.

Hare's Fur (Tu Hao): The Timeless Classic

Hare's fur appears as fine vertical streaks running down the bowl, like the fur of a running hare. It is the most classic Song Dynasty pattern — the one Emperor Huizong's court favored for tea duels — and today it offers the gentlest entry into authentic collecting. A well-fired hare's fur cup shows continuous, evenly spaced strands from rim to center; the soft sheen is its signature beauty.

Partridge Feather (Zhe Gu Ban): Rarity With Texture

Partridge feather glazes show mottled, overlapping patches with a subtle iridescence, like the breast feathers of a partridge. Genuine examples are rarer than oil spots because the crystallization is harder to control, and compound pieces that combine partridge patches with oil spots are prized by serious collectors.

Pattern Comparison

What About Yohen (Kiln Change)?

Yohen is the rarest category of all — iridescent halos of blue, purple and green that form under extreme kiln conditions. Only a handful of ancient yohen survive, and they are National Treasures of Japan. Modern artisans attempt them in every firing, but success remains a matter of chance and skill: a genuine yohen cup is a once-in-a-firing event. Explore all patterns in the Glaze Guide →

How to Choose

First cup: a well-fired hare's fur — classic, affordable, and beautiful in daily use.

Stepping up: a clear oil spot, especially in silver or gold, which anchors a collection.

The collector's move: a compound piece or partridge feather where the pattern shows the potter's mastery of chance.

Whichever pattern calls to you, buy from a studio that fires in authentic reduction and documents each piece — pattern and provenance travel together. Browse the Heritage Collection →

New to reading glaze? Start at the Knowledge Center.