IM Silk · Journal · Silk Fabric Care — Washing, Shrinkage, Dyeing & Storage

Silk Fabric Care: Washing, Shrinkage, Dyeing and Storage

Silk behaves like hair — it dislikes hot water, strong alkali and heat. Everything else about caring for it follows from those three, including why taffeta water-marks and why washed silk tolerates a machine.

Updated 2026-10-29 · Predatex Silk Co., Ltd. · Wuhu, Anhui, China

Care: washing, drying, pressing

Silk is a protein fibre, which means it behaves like hair: it dislikes hot water, strong alkali and heat. Almost every silk failure in the wash comes from one of those three, not from the water itself.

• Hand wash cold at around 30 °C with a pH-neutral silk or wool detergent. No biological detergent, no fabric softener, no bleach.
• Do not soak. Five to ten minutes is enough. Prolonged soaking lifts dye and dulls the lustre, especially on deep shades.
• Do not wring. Press the water out between palms or roll the piece in a towel.
• Dry flat, away from sun and radiators. Hanging wet silk stretches it under its own weight.
• Press on the reverse with a cool iron (silk setting, around 110 °C) through a pressing cloth. Never press a crepe flat or it loses its texture; steam and hang instead.

Which silks tolerate a machine? Washed, sandwashed and stretch qualities generally can take a cold gentle cycle in a laundry bag — start from the sandwashed page if that is the finish you need. Polished charmeuse, duchess satin, taffeta and organza should be hand-washed or dry-cleaned — water marks taffeta and dulls satin.

Shrinkage and what to expect

Expect 3–5% shrinkage on the first wash for most woven silk, and up to 8% on loosely woven or washed qualities. Shrinkage is not uniform: it happens mostly in the warp direction, so a 1 m length may lose 3–5 cm while the width barely moves.

For production, either pre-shrink the roll (a wash-and-dry cycle at the mill) or specify a sanforised finish, and always cut with the allowance written into the marker. For home sewing, pre-wash the whole length before cutting — a garment cut from unshrunk silk will be a size smaller after its first wash.

Dyeing silk fabric

Silk takes dye exceptionally well because the fibre is porous and has an affinity for both acid and reactive dyes. Which dye you use decides the result:

• Acid dyes (including food colouring with vinegar) — the easiest at home. Gentle heat, a splash of white vinegar, 30–60 minutes at 70–85 °C. Good for scarves and small pieces.
• Silk-reactive dyes — the professional route, and what we use in bulk. Excellent wash fastness and deep shades, but they need an alkaline bath and a fixing step.
• Pigment — sits on the surface, changes the hand and dulls lustre. Used for prints, not for solid dyeing.

Three practical notes. Pre-wash to remove sizing or the dye will patch. Wet the fabric evenly before it enters the bath or you will get a watermark at the fold. And remember that sandwashed and crepe surfaces dye slightly darker in the texture than on the flat — the same recipe can read a shade deeper than the sample card.

Storing silk between seasons

Print and colour are the other reason to care: a silk printed by the reactive digital process holds colour through gentle washing far better than a pigment print on the surface. Store folded in breathable cotton or acid-free tissue, not in plastic — trapped moisture and residual sericin attract mildew and insects. Avoid hanging silk knits or heavy satins for months, as they distort. Cedar blocks deter moths without the residue that mothballs leave in the fibre.

Care guidance varies with weight and finish. If you are specifying a production program, ask for the recommended care instruction in writing — we test-wash each quality before quoting it. More on weights in the momme chart.