Xiangyunsha is the only fabric I know of that is finished with river mud — and the only one whose production is legally confined to a single district. In Shunde, Foshan, silk is soaked in the juice of a mountain yam, spread on grass to bake under the sun, then painted with black mud dredged from the Pearl River delta. Do that enough times and the cloth turns the colour of a wet river stone on one side and burnt coffee on the other, rustles when you walk, and sells for three to five times what ordinary silk costs.
It is also widely faked. If you have been shopping for xiangyunsha online, there is a decent chance the “silk” in your cart is polyester printed to look the part. This guide covers what the craft actually involves, what the legal standard requires, five tests you can run at home, and how to keep the fabric alive once you own it.
What the name actually means
“Xiangyunsha” (香云纱) is the commercial name. The craft’s official heritage name is 香云纱染整技艺 — the dyeing and finishing technique, not the fabric itself. Two older names survive in the trade: 莨纱 (gambiered gauze) and 莨绸 (gambiered silk), plus the nickname 响云纱 — “the rustling cloud gauze” — because a genuine piece makes a dry, papery sound when you move in it.
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The recognition came in 2008, when the technique entered China’s second batch of National Intangible Cultural Heritage (item 890, code Ⅷ-107, traditional craftsmanship, nominated by Shunde District, Foshan). In 2011 the former national quality watchdog issued a geographical-indication (GI) order that limits the name to silk produced inside Shunde’s current administrative boundaries. In 2018 “伦教香云纱” was registered as a national GI certification mark.
The process: 14 documented stages, and the ones that matter
The GI technical specification attached to that 2011 order sets out 14 principal stages. In order: preparing the grey silk → preparing the shuliang yam liquor → soaking → sun-drying on grass → sprinkling and re-soaking → first sealing soak → first boiling → second sealing soak → second boiling → third sealing soak (“起货”) → mudding (过泥) → washing the mud off → fourth sealing soak (“复乌”) → “摊雾”, laying the cloth out to take in evening moisture.
Note what is not in the official text: a total number of days. CCTV-2’s 2023 documentary described the craft as “up to 30 stages” popularly summarised as 三蒸九煮十八晒 — three steamings, nine boilings, eighteen sun-dryings — with the yam soaking repeated nearly 30 times. A Shunde government page puts the cycle at “close to a year” including the seasonal waiting. Those are different things: the labour is weeks, the calendar can be a season, because the work stops when it rains.
The step that cannot be faked cheaply is 过泥. Inheritor Huang Tiansheng describes the rhythm as “看天吃饭” — you soak while the morning dew is still on the grass, spread the cloth under the harshest sun, and sprint to pull it in when a squall arrives.
Why mud turns silk black
The yam is 薯莨 (Dioscorea cirrhosa), whose juice is dense with tannin. The river mud of the delta carries ferrous iron. When the two meet on the cloth, the iron reacts with the tannin to form black iron tannate, fixed onto the fibre surface. Where the mud did not touch — the reverse side — the fabric keeps the red-brown of the yam liquor. That is why a genuine piece has a black face and a coffee-coloured back, and why printed imitations, which are coloured on one face only, look wrong the moment you turn them over.
What it costs, and why
When CCTV-2 filmed the trade in 2023, ordinary silk fabric retailed around ¥100+ per metre while xiangyunsha ran ¥300–500 per metre, and the finishing fee alone had climbed from a few yuan to about ¥20 per metre. A Guangxi sericulture body put the range even wider in 2025: “several hundred to over a thousand yuan per metre.”
The scale behind those numbers is smaller than most buyers assume. As of the end of 2025, Shunde’s Lunjiao subdistrict had 37 sun-drying fields covering nearly 1,600 mu, 15 finishing companies, and reported output above 10 million metres for the year — against a global trade of roughly 40 million metres in 2021. Sixteen people hold recognised inheritor status: 2 at national level, 2 at municipal, 12 at district level.
Five tests that separate real from fake
- Turn it over. The GI spec requires a black, glossy face and a coffee-coloured (or original-dyed) reverse, with visible 莨斑 and 泥斑 — blotches from the yam and the mud. A perfectly even “xiangyunsha” print is a warning sign, not a mark of quality: hand-sun-drying cannot be perfectly even.
- Check the label for fibre content. The GI physical standard requires 100% silk fibre. Anything blended or “silk-feel polyester” is not this product, whatever the listing says.
- Burn a thread from a seam allowance. Silk gives white smoke, smells like burning hair, and leaves a loose black ash that crushes to powder between your fingers. Polyester gives black smoke, shrinks and melts, smells sweetish, and leaves a hard bead. Cotton or rayon burns like paper and leaves a grey fluff.
- Listen. Crush a handful. Genuine xiangyunsha rustles — that is the origin of the name 响云纱. Polyester is silent or squeaks.
- Smell it. Real pieces carry a faint herbal, yam-like scent. Chemical-dye imitations smell of dye or sizing glue.
The published dimensional-stability requirement is also worth knowing: shrinkage must fall between −5.0% and +2.0%. If a seller cannot tell you the fibre content or the shrinkage, that itself is the answer.
One more thing that exists now and did not a year ago: in 2025 the industry published two group standards covering the dyeing technique and a grade classification (优等品 / 一等品 / 二等品), and the first graded results were released around the 2026 May Day season. If you are paying top money, ask which grade you are buying — the market previously had no shared yardstick, which is exactly why quality disputes were so common.
Care: what actually damages it
- Hand wash in cold or below-30°C water, with plain water or a mild neutral detergent. No soap, no alkaline detergent — the yam–iron complex does not like alkali.
- No machine washing and no rubbing. Use the “lift and dip” method (拎洗法); wringing creases permanently.
- Drip-dry in the shade. Do not sun-dry — the sun is part of the making process, but over-exposure afterwards fades it.
- Rinse sweat out promptly; do not hang on sharp metal hooks.
- Avoid mothballs (camphor) — they embrittle the fibre. Dry cleaning is the safe option if the budget allows.
- Iron below 150°C, through a cloth or after misting, never with the plate directly on the face, which leaves shine.
Some colour loss in the first washes and gradual lightening over time is normal. It is a surface-fixed dye, not a through-dyed one.
Where the craft is heading
It is not a museum piece. TANGY Collection showed a Spring/Summer 2026 “莨之色” line at TRANOÏ in Paris in October 2025. Inheritor Huang Tiansheng pushed a collaboration with Song brocade maker 上久楷 and took on four apprentices in May 2025. A dedicated industrial park opened in Shunde on 29 December 2025 — 1,134 mu planned, ¥120m investment, 11 companies signed at ¥189m. And younger designers are turning up with it: post-1995 designer Ouyang Xu, who showed in London, puts the case plainly — “有人用，才会传承下去” (it only gets passed on if people use it).
That is the honest case for buying it, and the honest case for paying more: the alternative to use is not criticism, it is the craft closing. In 2011, after a wave of machine-made fakes, only four xiangyunsha factories were left in Shunde.
What we could not verify
- An official total production time in days. Sources disagree (half a month vs “nearly a year”); we have not found a primary standard that states it.
- Authoritative retail price ranges for finished scarves and garments. We found credible fabric prices, not garment prices.
- Claims that xiangyunsha was given as a state gift to the Saudi royal family, or that French Vogue reviewed it. These circulate only in reposted articles; no primary source located.
- The popular “iodine / white vinegar” tannin colour tests. We found them only on self-media; the burn test and the fibre label are more reliable.
Sources
- General Administration of Quality Supervision 2011 Order No. 100, GI technical specification for 香云纱 (via cqn.com.cn, 2011-08-30) — process stages, chemistry, physical indices.
- China Intangible Cultural Heritage listing Ⅷ-107, second national batch 2008 (ihchina.cn).
- CCTV-2 《经济半小时》, broadcast 2023-09-05; figures via foshan.gov.cn 2023-09-07 — prices, output, “30 stages”.
- Shunde District government, 2026-05-13 — 37 drying fields, 10m+ metres 2025 output, 15 companies, group standards, industrial park.
- 南方+ / static.nfnews.com, 2026-04-22 — inheritor counts and names.
- Guangxi sericulture (gxqt.org.cn), 2025-09-24 — burn test, price range, smell test.
- Care guidance via bjdclib.cn, 2023-12-20.
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Sources & Further Reading
This article references the following authoritative sources for cultural and historical information:
- UNESCO Intangible Cultural Heritage Lists — Official registry of cultural heritage practices worldwide
- The Met Museum — Chinese Silk History — Guide to Chinese silk traditions
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