Fibres · Synthetic
Lurex / Metallic yarn
The thread that brings light into the knit: a metallised ribbon that glints with every movement. It is stiff and a little sharp, so it is not used alone but in small doses, alongside a soft yarn that gives it body.
Translated from Italian. A native knitter has not reviewed this translation yet.
History
Metallic thread is very old: for centuries embroidery was worked with real gold and silver threads, costly and heavy. The modern version dates from the mid twentieth century, when it became possible to metallise a very thin polyester film: light, flexible, cheap and as bright as real metal. The name everyone knows it by comes from a trademark that has become a synonym for the product, and it is the sparkling signature of evening and party knits.
How the yarn is made
It is neither spun nor shorn: a polyester film is extruded and coated with a metallised layer, often aluminium, and with a pigment that gives the colour (gold, silver, copper, or iridescent shades). The film is then slit into very fine ribbons and usually wrapped or twisted around a core of more pliable yarn, so it can be worked without breaking.
Why it is prized
Its value is purely aesthetic: no other fibre gives the same metallic shine at so little weight. One strand held together with every hundred or so grams of main yarn is enough to light up a whole sweater with glints without stiffening it. It is the decorative accent par excellence, the one that turns a simple piece into a garment for an occasion.
Dyeing
It is not dyed during processing: the colour is already in the film, given by the metallising and by the pigments applied during production. This is why the range is one of metallic glints (warm gold, cool silver, bronze, gunmetal) and iridescent finishes, very stable over time because they are not a surface dye but part of the thread.
Care
Utmost care. Hand wash in cold water, without wringing or twisting, because the film creases and loses its shine. No tumble dryer and never a hot iron directly on it: heat distorts it and dulls it. It does not felt and does not pill on its own, but the sharp edges of the ribbons can, over time, mark the softer fibres next to them.
End of life
It is a composite material, plastic film plus a metal layer, and is neither biodegradable nor easy to recycle: the metallised part contaminates the polyester recycling stream. The most sensible route is to make the garment last and reuse it; on its own, unfortunately, it almost always ends up in landfill.
How to recognise it
| Hand | Cold, smooth and slippery, with a dry stiffness that does not give: you can feel the flat ribbon, and running a finger against the grain it may feel slightly sharp. |
|---|---|
| Look | Unmistakable: a metallic, mirror-like surface that reflects light like a mirror, with no halo and no crimp. The thread looks flat and very shiny, not hairy. |
| Behaviour | It has no elastic recovery: stretch it and it stays stretched, it does not bounce back. It tends to hold a crease, gives no warmth and, knitted alone, makes a stiff fabric with no memory. |
| Burn test | Synthetic signature with a metal residue: the polyester film melts and shrinks away from the flame with a sweetish, chemical smell, but the metal layer does not burn and leaves a stiff grey trace instead of crumbly ash. |
| Home tests | Burn test: the plastic part melts and shrinks back, leaving a metallic filament that does not burn · Stretch test: pull and release, the thread does not return, it stays deformed · Touch test: flat ribbon, cold and slippery, with an edge that is almost sharp |
| Confused with | Yarns with applied sequins or flakes: but there the sparkle comes in separate dots, here it is a continuous ribbon · Real gold and silver embroidery threads: heavy and warm to the touch, whereas modern metallic yarn is extremely light |
| Only in a lab | Establishing the exact nature of the substrate (polyester or polyamide) and of the metal layer requires laboratory analysis; by eye you can only recognise the family, not the precise composition. |
Physical facts
| Property | Value | Source |
|---|---|---|
| elastic memory | None | research |
| sag | Low (stiff/sharp) | research |
| halo | None | research |
| lustre | Shiny | research |
| metallic | Sì | research |
| felting risk | None | research |
| fineness (µm) | — | research |
| moisture regain (%) | 0.4 | research |
| typical shrinkage (%) | 0–2 | estimate |
| staple length (mm) | — | research |
measured = a measurement with a reference · iso = a standard · research = a verified source · estimate = plausibility only
Good for
shiny details and accents · held together with a soft yarn · evening and party wear · glittering stripes and inserts · decorative edgings and trims
Less good for
garments knitted with it alone · garments worn against bare skin · knits that must stretch and spring back · projects washed often