丝绸

The mythological discovery of silk is attributed to 嫘祖 (Léizǔ), the wife of the Yellow Emperor, who — according to the legend — dropped a silkworm cocoon into her hot tea and watched it unravel into a continuous thread of extraordinary length and fineness. Whether or not this specific story is historical, the archaeological evidence confirms that China was producing silk by approximately 3500 BCE — over 5,000 years ago — making it the oldest continuously produced luxury textile in human history.

The Chinese maintained a monopoly on silk production for roughly three millennia. The penalty for revealing the secret of sericulture (養蠶, yǎngcán) — specifically the existence and nature of the silkworm and its relationship to the mulberry tree — was death. Roman writers described Chinese silk as being combed from trees, having no idea it came from insect cocoons. This ignorance was carefully maintained.

The secret finally broke in the sixth century CE when, according to Byzantine sources, two Nestorian monks smuggled silkworm eggs out of China hidden in hollow walking staffs, bringing sericulture to the Byzantine Empire. Silk production subsequently spread to Persia, the Arab world, and eventually medieval Europe — ending China's monopoly but not its dominance as a producer of the finest silk.

Silk production begins with the 桑蚕 (sāngcán, mulberry silkworm, Bombyx mori) — a domesticated moth that feeds exclusively on mulberry leaves. The worm has been so thoroughly domesticated over millennia that it can no longer survive in the wild; it is entirely dependent on human care. The adult moth cannot fly.

The worm spins its cocoon from a single continuous filament of protein (fibroin) that can reach 1,500 meters in length. To unravel the cocoon without breaking this thread, the cocoon must be immersed in hot water to dissolve the outer sericin coating, and the thread carefully reeled onto a bobbin. Multiple threads are combined (typically five to eight) and twisted to produce the silk yarn used for weaving.

Traditional silk weaving — particularly the complex brocades and damasks produced at imperial workshops in Suzhou and Hangzhou — required mechanized looms (织机 zhījī) of considerable sophistication, some of which are considered precursors to Jacquard loom technology. The horizontal draw loom, capable of producing complex patterned silk, was in use in China by the Han dynasty.

The term 丝绸之路 (Sīchóu Zhī Lù, "Silk Road") was coined by the German geographer Ferdinand von Richthofen in 1877 — it was never a Chinese phrase. What it describes is a network of overland and maritime trade routes linking Han China to Central Asia, the Middle East, and eventually the Mediterranean from roughly the second century BCE onward.

The Han Emperor Wu sent the diplomat 张骞 (Zhāng Qiān) westward in 138 BCE to seek an alliance against the Xiongnu nomads. Zhang Qian was captured and held for years before eventually returning with detailed intelligence about Central Asia — and with news that there were wealthy kingdoms to the west hungry for Chinese goods. Han silk began flowing west in quantity, and the trade routes were established.

Silk was not the only commodity traded — paper, porcelain, spices, horses, glassware, textiles, and Buddhist art all moved along the routes in both directions. The Silk Road was as much a transmission belt for religions, diseases, technologies, and ideas as for material goods. Buddhism reached China via the Silk Road. The Black Death possibly did too.