Imagine two celadon pieces from the same kiln and the same firing. One is buried in Henan, the other in Zhejiang. A century later they are dug up:

One has crackled glaze and soil stains deep in the body. The other has clean glaze, still shining like new.

It is not a different kiln, and not a different period. It is a different burial environment.

This is what the term "pit type" really means.

The climate and soil of northern and southern China are almost opposites.

That difference decides how antiques look when they come out of the ground.

Buried in soil, porcelain undergoes mainly two things: glaze crackle and staining.

Northern porcelain: dry soil and large temperature swings produce fine crackle. But soil activity is weak, so staining tends to stay near the surface and not sink into the body.

Southern porcelain: long-term humidity slowly causes glaze flaking or dissolution. Iron, manganese, and other elements seep in over centuries, forming deep stains. Some southern finds are stained entirely brown or grey.

So the same celadon piece: a northern pit often yields clean glaze with clear crackle; a southern pit often shows staining, flaking, and even local rust spots.

Bronze is even more sensitive. Copper reacts with different soil chemistries to produce entirely different patinas.

Northern bronzes: dry, alkaline soil produces grey-green, blue-green patina, sometimes with "black lacquer" — a dense dark brown oxide layer. The patina tends to be thin and stable.

Southern bronzes: humid, acidic soil produces thicker, brighter patina. Red rust, green rust, mercury stain are common. Some southern pieces are so encrusted that the original decoration is barely visible.

Water-pit bronzes: long immersion produces a special "water-pit patina" — grey-blue, relatively even, sometimes with a silvery sheen.

Three environments, three patinas. Read the patina and you can roughly place the burial region.

Jade works the same way.

Northern jade, buried dry, usually shows shallow, localised staining — iron stain and soil stain being common. Southern jade, buried wet, shows deeper, broader staining — water stain, chicken-bone white, and similar effects.

Bamboo, wood, and ivory are harder still. Bamboo and wood essentially cannot survive burial in the south. What survives comes mostly from dry northern regions or from handed-down pieces.

So when you see an "old bamboo carving" on the market, ask: was it really buried in the south? If the seller says "southern excavated", you should know that is almost impossible.

Many newcomers treat "northern pit" and "southern pit" as "good" and "bad". That is a misunderstanding.

Both types are genuine — they simply came out of the ground looking different.

Northern finds are usually more popular on the market: clean glaze, clear decoration, better for display.

Southern finds often fetch less, but a dedicated circle of collectors actively seeks them out — because those deep stains cannot be produced in the north.

Fakers study pit types too. They can imitate northern crackle and southern staining. Which is why reading the pit is not the goal — reading the piece is.