Polyester has learned to shimmer. Here are the senses and small tests that still separate true silk from its clever imitations, used in the atelier daily.
Imitation silk has grown alarmingly good. The best polyester satins now mimic the drape and the sheen so well that a photograph can no longer be trusted, and the price tags have learned to lie convincingly too. But the imposters give themselves away to the senses. Here is how a piece of cloth is interrogated on the atelier table — no laboratory required.
First, the warmth
This is the test I trust above all others. Take the cloth in a closed palm and hold it for a slow count of thirty. Real silk is a protein fibre — it is, in a sense, kin to your own skin — so it warms quickly to body temperature and stays warm, with no clamminess. Polyester is plastic. It resists warming, holds a faint coolness, and the moment you open your hand it loses what little heat it took. Silk feels alive against the skin; synthetics feel like weather.
Then, the light
Tilt the fabric slowly under a single light source and watch the colour. True silk is dichromatic: its triangular fibres refract light so that the surface shifts hue as the angle changes — a champagne reads gold, then ivory, then almost pink. Polyester shines, but it shines the same flat colour from every angle, a white glare laid over the dye. Natural silk glows from within; imitation glares from the surface.
“Synthetics shine at you. Silk shines through you. Once you have felt the difference you cannot unfeel it.”
Yaya, Founder & Creative Director
The small tests
- The scrunch. Crush a section in your fist and release it. Silk springs back almost smooth with only soft, organic wrinkles. Polyester either refuses to wrinkle at all (suspiciously crisp) or holds hard, sharp creases.
- The sound. Rub two layers together near your ear. Real silk produces a faint, dry crepe — the famous scroop. Synthetics are mostly silent or make a slick, squeaky sound.
- The ring test. Pull a wide piece through a ring on your finger. Fine real silk slips through effortlessly and re-forms; many synthetics snag or bunch.
- The price and the momme. Genuine silk is sold by weight; a luxury price with no stated momme and a featherlight hand is the oldest tell of all.
The burn test, used with care
The most definitive test is reserved for a single thread pulled from a seam allowance or swatch — never a finished garment. Touch a flame to it. Real silk burns slowly, curls away from the flame, self-extinguishes, and leaves a brittle black ash that crushes to powder between your fingers, smelling distinctly of burnt hair or feathers — the signature of protein. Polyester does the opposite: it melts and shrinks toward the flame, drips, and hardens into a shiny black bead that will not crush, smelling of chemicals and plastic.
You will rarely need the flame. The warmth in the palm and the colour-shift in the light are enough to settle most questions in seconds. Trust your hands; they were judging silk long before there was anything to imitate it.
