A white T-shirt comes out of the bag with a faint blue-grey ring behind the neck; the buyer complains the hang tag dyed the garment; a batch of pale dresses sails three weeks in a container and arrives as a return. These are not printing defects but colour migration and staining from garment trims. It is a different property from light or wash fastness, and it often passes normal laboratory wash tests while failing under real shipping and storage conditions.
1. Three Migration Routes, Three Different Tests
| Route | How it happens | Typical sign | Test to cite |
|---|---|---|---|
| Wet migration | Damp, sweating or after washing, in contact with pale fabric | A halo of colour around the stitching | Fastness to water, fastness to perspiration |
| Rubbing transfer | Tag rubbing against the garment, stacking, handling | Streaks or spots where the two touch | Colour fastness to rubbing, dry and wet separately |
| Heat sublimation | Hot containers, long sea legs, ironing or stifling storage | Adjacent items dye each other, film fogs | Fastness to sublimation, multi-fibre adjacent strip |
Which test you need depends on what touches what, and in what state. A tag lying flat on a folded garment carries both rubbing and moisture risk; a dark PVC bag in a container above 50°C carries sublimation risk; a woven label sewn into a white shirt is mainly a water and perspiration question.
2. The Five Risk Combinations
- A dark tag with white or pale garments: especially full black, deep navy or deep red art-card tags. A coated paper surface carries a heavy ink load, and ink that has not fully cured transfers straight to fabric under stacking pressure.
- Dark woven labels or tape against a white body: neck labels, waist tapes and decorative ribbons are all risk items. Woven-in black from dyed yarn is usually more stable than printing, but surplus dye on a poor-quality yarn still migrates under perspiration.
- Dark paper bags or boxes with pale garments: when a pale item goes straight into a dark-lined bag with no barrier, a faint tint appears on the contact face after a long shipment.
- PVC bags or soft PVC labels in hot shipment: plasticiser in flexible PVC migrates in heat and carries printed pigment with it, showing up as tacky, yellowed or locally stained garments.
- Mixed colours in one carton under pressure: dark and pale pieces pressed together, especially items with foil, pearl or fluorescent coatings, mark each other where they rub.
3. Preventing It at Design and Sourcing Costs the Least
- Make the dark colour part of the material: if it can be woven from black yarn, weave it; if a dark substrate exists, do not print the black. One less ink layer is one less source of migration.
- Add a barrier: a white reverse or a lamination on a dark tag, a pale liner inside a dark bag or a PE inner bag — the most direct fix available, at a small cost with immediate effect.
- Control drying and fixation: dry thoroughly after printing, give dark inks full curing time and add fixation or coating where needed. Compressing drying time on a rush order is the classic cause of dark tags staining.
- Order and placement: pale items outward and dark inward in the same carton, accessories separated by card or bubble, tags always facing the garment with their reverse out. All of it costs nothing.
4. Shipping and Storage Are Where It Usually Goes Wrong
- A sea container in the sun regularly reaches 50–60°C, enough to sublime disperse dyes and mobilise plasticisers. Dark and pale cargo in the same container should have at least one barrier between them, or travel in separate containers.
- Add desiccant and control humidity inside the pack when shipping in rainy seasons or humid regions. Moisture reactivates reactive dyes and water-soluble inks, which explains many cases of “it passed the wash test but still stained”.
- In the warehouse, avoid long-term storage of pale garments in the same zone as cartons of dark trims; a hot, unventilated store accelerates migration as well, especially in summer.
💡 Practical tip: dark-tag staining breaks out most when a rush order, a rainy season and sea freight coincide. If an order ticks all three boxes, switch the dark background to dyed material or add a white reverse, and allow full drying time — far cheaper than handling returns at destination.
5. Inspection and Complaint Handling That Protects You
- Turn it into executable clauses: one line each for fastness to water (wet staining), to rubbing dry and wet, and to sublimation, with the test method named. A vague “must not bleed” leaves both sides unable to prove anything in a dispute.
- Reproduce first: use a retained sample and run an accelerated simulation at the temperature and duration described (for example 24 hours in a 50°C oven with a damp cloth in contact). If it reproduces, review your process; if it does not, examine their shipping and storage before accepting liability.
- Keep lots traceable: yarn lot, ink lot, drying and ship dates all retrievable. Staining complaints are in most cases a one- or two-lot problem rather than a wrong material overall.
Related Articles
- Trims FAQ: all articles
- Woven Label Colourfastness Guide: Washing, Rubbing and Bleeding
- Poly Bag Marking Guide: Printing, Warnings and Compliance
- Moisture-Proof Garment Packaging: Desiccants, Humidity and Sea Freight
- Trim Light Fastness and Fading Guide
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