From Cocoon to Thread: How Thai Silk Is Reeled

In the villages outside Chonnabot, in Khon Kaen province, there are mornings that begin with steam. Not the steam of a kitchen but something more particular: the faintly musty, slightly sweet vapour of silk cocoons being softened in pots of near-boiling water. It is the smell of silk in its earliest, most fragile form, and it is where all Thai silk begins — not at the loom, not at the dye vat, but in this moment when a thread is coaxed from something that was, until recently, alive.

Why does silk come from a worm?

The silkworm is not really a worm at all. It is the caterpillar of the moth Bombyx mori — a creature domesticated over such a long stretch of centuries that it can no longer survive without human care. In Thailand, the caterpillars are raised in low trays and fed exclusively on the leaves of the white mulberry tree. They eat, almost without stopping, for about a month. Then the caterpillar stops eating, lifts its head, and begins to spin.

What it produces is remarkable: a single, continuous filament of two silk proteins — fibroin on the inside, sericin (a natural glue) on the outside — secreted simultaneously from paired glands just below its head. Over three or four days, the worm traces a figure-eight pattern around itself, building up a cocoon of roughly a thousand meters of unbroken thread. Then it rests inside, beginning its transformation into a moth.

Why does the cocoon have to be heated?

Here is the difficult part: to unwind the cocoon without breaking the thread, the transformation must not be allowed to complete. A moth does not emerge gracefully — it dissolves a section of its cocoon wall with an enzyme, breaking the long filament irreparably. So the cocoons are collected when the chrysalis is newly formed and plunged into water held just below boiling. The heat kills the chrysalis and, crucially, softens the sericin — the glue holding the filament layers together — so that the thread can be found and wound off cleanly.

This step sits awkwardly in the otherwise graceful narrative of a craft that prizes patience and living process. The most honest thing to say is that the production of silk has always carried this cost, and that handmade Thai silk, made in small quantities by village weavers, uses a fraction of the cocoons consumed by any industrial process. The scale is different; so is the intention.

How is the thread found and unwound?

Once the water is hot and the sericin has softened, the reeler uses a small brush — often a bundle of grass or fine bamboo — to search the surface of the floating cocoon for the thread end. Finding it is the first skill: the filament is so fine it is nearly invisible against the white surface of the cocoon. Once found, it is led up and over a guide, then wound onto a reel.

No single cocoon produces a thread thick enough to weave with. Several — often five to eight for a traditional Thai weft silk — are combined from the start, their thread ends led together as a single strand. As one cocoon is exhausted, the reeler splices in a new one, reaching into the steaming pot with practiced fingers. The work is continuous and cannot be hurried; the thread breaks if pulled unevenly, and a break requires finding the loose end all over again.

In small-scale village reeling, this is done on simple hand-turned equipment — a rotating cage or bamboo spool — over pots heated on a wood or gas flame. What comes off the reel is raw silk, still coated in its sericin, still slightly stiff: the gum will remain until a later degumming wash reveals the full, breathing luster beneath.

What makes hand-reeled silk different from machine silk?

Somewhere in this process of imperfect splicing, hand-tension, and batches that vary from pot to pot, the quality that makes Thai silk recognizable begins to develop. A hand-reeled thread is slightly uneven — not in a way the eye can always detect, but in a way the body can feel and the light registers. That slight variation in diameter is what gives handmade Thai silk its soft, living sheen: the thread catches light at slightly different angles along its length rather than reflecting it uniformly, the way a machine-wound monofilament does.

Industrial silk production solves the variation. Hand reeling preserves it — not as a flaw, but as the evidence of individual judgment, of fingers that adjusted their pressure and speed over hundreds of meters by feel alone, responding to each new cocoon the way a musician responds to a new phrase.

How much silk does a single piece take?

A mudmee silk scarf weighing perhaps 60–80 grams requires many hundreds of meters of thread. Each meter of thread required dozens of spliced cocoons; each cocoon was a month of careful cultivation, a feeding schedule of fresh mulberry leaves prepared daily. By the time that scarf reaches the loom — before a single motif has been tied, before it has touched the dye — it already carries weeks of quiet, precise work.

The weaving, the tying, the dyeing: these are the dramatic acts that tend to get the attention. But the thread is the beginning of everything. All that follows depends on what was found, with a grass brush and steady hands, in a pot of near-boiling water on a Khon Kaen morning.

To see the thread become cloth — to follow it through the tying and dyeing that sets the pattern before the loom ever moves — the story continues in how mudmee ikat is made. Or to hold the finished silk, the mudmee silk ikat scarf and mudmee silk table runner each begin exactly here.