Chinese silk: a 3,000-year secret and the road that linked the world

In the silence of a workshop, a worker plunges the white cocoons into hot water, searches with her fingertips for the end of an invisible thread, then pulls: from a single cocoon unwinds a continuous line nearly a kilometre long, finer than a hair and stronger than one imagines. Multiplied by millions, this fragile marvel clothed emperors, enriched dynasties and linked continents. This is the silk of China.

Silk is one of the oldest and most precious secrets of Chinese civilisation. Invented several millennia ago, jealously guarded for centuries, it gave its name to the famous Silk Road that linked China to the Mediterranean. To understand silk is to follow the thread of a history in which a butterfly's cocoon became the currency of an empire, an object of global desire and a matter of espionage.

A thread drawn from a cocoon#

Silk is a natural fibre produced by the caterpillar of a moth, the Bombyx mori, the domestic silkworm, which feeds exclusively on mulberry leaves. To metamorphose, the caterpillar secretes a long protein filament that it winds around itself into a cocoon. It is this single filament, unwound and then woven, that becomes the silk thread.

The rearing of the silkworm and the production of the fibre form sericulture, an art of great delicacy. The caterpillars must be fed fresh leaves, the temperature watched, the cocoons scalded before hatching to preserve the continuous thread, then unwound, spun, woven. Each step demands patience and know-how — and it is this complete mastery that China developed long before the rest of the world.

A single cocoon yields nearly a kilometre of thread; it takes thousands for one cloth. Silk is a luxury born of the infinite patience of a small worm and the hand of man.

The legend of Leizu and the dawn of silk#

The origin of silk is lost in legend. Chinese tradition attributes it to Leizu, wife of the Yellow Emperor, the mythical sovereign of the origins. The tale holds that a cocoon fell into her cup of hot tea; in trying to remove it, she is said to have seen a silken thread unwind and understood that it could be woven. She has since been revered as the "goddess of silk."

Beyond the myth, archaeology confirms a dizzying antiquity: fragments and tools linked to silk have been found at Chinese Neolithic sites, dating sericulture back several millennia before our era. Under the dynasties, silk became a pillar of the economy and of power: taxes, soldiers and tributes were paid in bolts of silk, a true state currency.

The best-kept secret of antiquity#

China held the world monopoly on silk for centuries, and watched fiercely over its secret. The method of manufacture — the rearing of the worm, the role of the mulberry — was a state mystery, and to export Bombyx eggs or mulberry seeds could be punished by death. Distant peoples received the cloth without ever understanding how it was made.

This ignorance fed fables: in Rome, it was long believed that silk grew on trees, combed like a vegetable wool. The Romans, mad for the material, imported it at the price of gold, to the point that voices grew anxious about the haemorrhage of silver toward the East. Silk was not merely a fabric: it was an object of wonder and fantasy, whose origin remained untraceable.

The Silk Road: a network that linked worlds#

To carry silk westward, one of the greatest commercial networks in history was born: the Silk Road. The term itself is recent — it is the German geographer Ferdinand von Richthofen who coins the expression Seidenstraße in the nineteenth century. The reality, however, goes back more than two thousand years, under the Han dynasty, which opened the routes toward Central Asia.

It was not a single road but a sheaf of caravan tracks linking Chang'an (present-day Xi'an) to the markets of Persia, the Levant and, by stages, Rome. Far more than silk was exchanged there: spices, jade, glass, horses, metals. And above all ideas: Buddhism reached China by these routes, as techniques, religions and languages circulated between East and West. Silk gave its name to a true highway of civilisations.

When the secret escaped#

The Chinese monopoly could not last forever. The secret of sericulture gradually crossed the borders — toward Korea, Japan, India, Central Asia. But the most famous episode unfolds in the sixth century: according to the Byzantine chronicler Procopius, the emperor Justinian is said to have charged two monks with bringing back the secret from the East.

The monks, it is said, concealed silkworm eggs in their hollow canes and carried them to Constantinople, breaking the thousand-year monopoly. True or embellished, the story marks a turning point: Byzantium could then produce its own silk, and Europe after it. China remained a great producer, but the secret had taken the road in the opposite direction.

China's silken legacy#

Silk has never ceased to embody China. It clothes court robes, qipao and hanfu, serves as a support for painting and calligraphy, and remains today a sector in which China is still the world's leading producer. The Silk Road, for its part, knows a second symbolic life in the great contemporary Eurasian infrastructure projects that claim its heritage.

From the scalded cocoon to the desert caravans, from Leizu to Justinian's monks, the history of silk weaves that of exchange between peoples. To discover silk is to hold between one's fingers a thread that literally linked civilisations — and to learn Chinese is also to grasp these words, sī, Leizu, that tell how a humble worm gave China one of its most enduring radiances.

FAQ#

How is silk made? Silk is produced by the silkworm (Bombyx mori), which feeds on mulberry leaves and weaves a cocoon from a single long filament. The cocoon is scalded, the thread unwound, then spun and woven. This is sericulture.

Who invented silk? Chinese tradition attributes it to Leizu, wife of the Yellow Emperor, who is said to have discovered the thread by removing a cocoon from her cup. Historically, sericulture goes back in China several millennia before our era, attested by archaeology.

Why do we speak of a "Silk Road"? Because silk was the emblematic commodity of the trade routes linking China to the Mediterranean. The expression was coined in the nineteenth century by the geographer Ferdinand von Richthofen; the routes themselves go back to the Han dynasty.

How did the secret of silk leave China? It spread gradually toward neighbouring Asia, then, according to a famous tradition, in the sixth century, when monks are said to have brought silkworm eggs hidden in their canes to Byzantium, on the orders of the emperor Justinian.

Photo credits: the images used in this article come from Pexels and Unsplash and are royalty-free.