Why does a dark hoodie stain other clothes?

Short answer: Dark hoodies stain other clothes when dye is not fully fixed in the fabric or when loose dye and pigment remain on the surface. Transfer happens in three main ways: dye bleeding into the wash water and onto other garments, rubbing transfer where the hoodie rubs against light clothes or bags during wear, and transfer under sweat. Deep shades need more dye, which raises the risk, and incomplete washing-off after dyeing, unsuitable dye selection, poor fixation or pigment prints and garment dyes without proper fixing all make it worse. To reduce the problem, ask the mill for correct dye selection and thorough washing-off for dark shades, and test before bulk. ISO 105-C06 measures colour fastness to laundering including staining of adjacent fabrics, ISO 105-X12 measures rubbing fastness, ISO 105-E04 measures fastness to perspiration, and staining is rated with the ISO 105-A03 grey scale. Agree minimum ratings in the order and test each dark colour lot. Labelling matters as well: the FTC's guidance on the US Care Labeling Rule says that if an item is not colourfast, the label must warn, for example "Wash with like colors" or "Wash separately".

How colour transfers

• Bleeding into wash water.
• Rubbing during wear.
• Transfer under perspiration.

Causes

• Deep shades with high dye loads.
• Incomplete washing-off after dyeing.
• Unsuitable dye selection or poor fixation.
• Surface pigment from prints or garment dyes.

Testing

• Washing fastness with staining of adjacent fabrics.
• Rubbing fastness, dry and wet.
• Perspiration fastness.

A worked example

As an illustration, if a navy fleece stains white fabric in a rub test, the mill could improve washing-off or adjust the dye recipe, and the brand could retest the corrected lot before cutting.

Labelling and care advice

Base care labels on test results. If transfer cannot be fully prevented on very dark shades, include a warning and advise washing with similar colours, especially for the first washes.

Responding to a complaint

When a retailer reports transfer, ask for the affected lot numbers and samples, retest retained pieces from those lots, and compare with the original test reports. If the lot fails, agree corrective actions with the mill and decide with the retailer how affected stock and customers are handled.

Limits

Very dark shades always carry some risk of transfer, especially when new. Testing and fixation reduce it but cannot remove it entirely.

Facts, recommendations and uncertainty

Established: unfixed or surface dye causes transfer in washing, rubbing and sweat. Recommendation: test washing, rubbing and perspiration fastness on dark lots and label correctly. Uncertain: how your customers wash and wear dark hoodies.

Sources and further reading

• ISO 105-C06:2010 — Colour fastness to domestic and commercial laundering
• ISO 105-X12:2016 — Colour fastness to rubbing
• ISO 105-A03:2019 — Grey scale for assessing staining
• ISO 105-E04:2013 — Colour fastness to perspiration
• U.S. FTC — Clothes Captioning: Complying with the Care Labeling Rule

Standards and regulations are referenced by their published scope. Test parameters, cycles and pass levels should be agreed with your laboratory for the specific product; legal requirements should be confirmed for each destination market.