In Chinese bronze collecting there is one name that everybody knows — and nobody dares claim to have seen the real thing.

It is the Xuande censer.

For five hundred years, from the Ming to today, countless people have copied it. But what the genuine pieces actually look like — nobody can say clearly.

The story begins in 1428, the third year of the Xuande reign.

That year, Siam (today's Thailand) sent a tribute shipment of copper — called in the records "wind-milled copper", refined by repeated weathering and hammering.

The Xuande emperor looked at the copper and had an idea: cast a set of censers from it.

He ordered designs from the court painters, summoned the best bronze casters from across the empire, and allocated special funds from the Imperial Household Department.

The first batch came out of the mould — and the emperor was not satisfied. The copper was impure, the patina unattractive. So it went back into the furnace. This repeated, and according to one account the copper was re-smelted twelve times before it met the standard.

The final count: some say three thousand censers, some say five thousand. The records give no clear number.

That is the origin of the "Xuande censer".

Legend says that after the censers were cast, all the drawings and records were sealed into a box and stored in the palace.

But the archive was later lost.

Some say it burned in the chaos of the late Ming; some say the Qianlong emperor ordered it destroyed; some say it never existed at all.

Worse still: nobody can account for the censers themselves.

Some stayed in the palace, some were given to ministers and temples, some leaked into private hands. After the wars of the Ming-Qing transition, the great majority disappeared.

So from the mid-Ming onward, people began making their own "Xuande censers". By the Qing, "imitating Xuande censers" had become its own industry.

When you see a "Xuande censer" in the market today, you can be almost certain it is not from 1428. But is it a Ming copy, a Qing copy, or a Republic copy? That is another question.

Over five hundred years, the Xuande censer has been copied generation after generation. Each era's copies have their own character.

Interestingly: a mid-Ming copy is itself an antique today. And it is not cheap. So the term "Xuande censer" no longer refers to one era — it refers to a whole category.

If you want to buy a Xuande censer today, the practical rule is: do not chase the "real Xuande". Chase a good censer.

How to judge whether a censer is good? Four points:

First, the copper. Feel the weight, listen to the sound. Good censers have fine copper, feel heavy in hand, and ring long and deep. Whiter, lighter copper, or a sharp sound, means inferior.

Second, the patina. Look at the colour. Good patina comes from within, with layers and depth. Dead, surface-level colour is applied later.

Third, the mark. Look at the base. Ming marks are broad and generous; Qing marks are neat and fine; Republic marks are stiff. Whether the strokes feel natural is the most direct clue to period.

Fourth, the form. Look at the proportions. Old censers have flowing lines and lively presence; new ones are often "too perfect" or "too stiff".

Real collecting is not about fighting over the word "Xuande". It is about buying a piece with fine craft, beautiful patina, and clear period — whether Ming, Qing, or Republic.