How to Tell if Silk Is Real: Seven Checks

What these checks cannot do

None of them is a laboratory result, and it is worth being straight about that before listing them.

The only definitive answer to "is this silk" is the fibre content statement that comes with the cloth, and even that is only as reliable as the supplier making it. These checks are for the cases where you have a scarf in your hand and no paperwork — which is most of the time when a sample first arrives.

Treat them as a filter, not proof.

The seven checks

1. The sheen

Hold the scarf up and turn it slowly. Silk has a soft lustre that moves across the surface as the light changes — the shine appears, shifts and softens. Synthetic fabric tends to have a flat, high shine that looks the same from every angle, and it often looks brighter than silk in a photograph while looking cheaper in person.

2. The temperature in the hand

Rest the scarf across your palm for a few seconds. Silk warms up quickly and holds the warmth; polyester stays cool for longer and then feels slick. It is a small thing and it is one of the fastest ways to tell, because you already know what warm fabric feels like.

3. The crumple

Squeeze a section in your fist, hold it for a few seconds, then open your hand. Silk creases — softly, and the crease relaxes rather than snapping out. Polyester springs back to smooth almost immediately, because it does not hold a fold. This is the same property that makes a silk scarf hold a knot, so it doubles as a check on whether the scarf will behave when worn.

4. The rustle

Rub a fold of the cloth between finger and thumb next to your ear. Silk makes a soft, dry rustle — the sound the trade calls scroop. Synthetics are either silent or produce a higher, squeakier note. It is a crude test and it is surprisingly consistent once you have heard the difference on a known piece.

5. A drop of water

Put a single drop of water on the cloth and watch it for a few seconds. Silk is a protein fibre and absorbs water into the fibre; polyester is hydrophobic and the drop sits on the surface as a bead. Blot it afterwards — you do not want a water mark on a finished scarf.

6. The label, and how it is written

Read the fibre content statement rather than the brand. "100% silk" and "100% mulberry silk" mean different things, and a blend has to declare itself — a scarf described as silk that carries a percentage alongside another fibre is a blend, whatever the front of the tag says. Where the composition is stated, it is the most reliable single line of evidence you have.

7. The burn test

This is the confirmation step, and it needs care. Take a single loose thread, or a small cutting if the supplier provides one, and hold it over a sink with a flame, away from anything flammable. Silk burns with a smell like burnt hair, because it is a protein fibre, and leaves a soft black ash that crushes between your fingers. Polyester melts rather than burns, smells chemical, and leaves a hard bead that will not crush.

Do this outdoors or over a sink with water running, never over a carpet or near anything else that will catch. And do it on a thread you can spare — not on the scarf.

The checks that do not work

Some of the folk tests that circulate are worth discarding, because they give false confidence.

• "It was expensive, so it is silk." Price tracks the brand and the retail channel far more than it tracks the fibre.
• "It feels cool to the touch." Both silk and polyester feel cool when you first pick them up. The difference is what happens after a few seconds, which is check two.
• "It is shiny." Shine is a finish, and polyester can be given more of it than silk has naturally.
• "It does not crease, so it must be good silk." Not creasing is a property of synthetics, not a sign of quality. Silk creases.
• "The label says 100% silk." The statement is the best evidence available, but it is a claim by the supplier, not a test. That is exactly why the physical checks are worth doing as well.

Checking a whole order, not one scarf

A single scarf tells you about a single scarf. In a production order the question is whether the run is consistent, and that is a different check.

• Take the scarf out of the bag and look at it unfolded, not folded. Print registration problems and edge faults hide in a fold.
• Check the same detail at both ends of the piece. Colour can drift across a run, and the two ends are where it shows first.
• Look at the edge along its whole length, not just at one corner. A hand-rolled hem is worked by hand, so the place to look for inconsistency is where the finisher changed.
• Compare against the approved sample rather than against memory. If you approved a physical sample, that sample is the specification — everything else is an opinion.

This is why we send a physical sample before a bulk run, and photographs of the finished order before it ships. Both exist so that a surprise happens while it is still cheap.

Questions we are asked about checking silk

Where to go next

For what the fibre actually is, read what silk is. For where it comes from and why that shows up in the cloth, origins of silk. For the claims that get made about silk — and which of them hold up — mulberry silk: which claims hold up. And for what happens between your artwork and a packed order, the craft pages walk the nine steps.