Short answer
Bleeding happens when a colourant that should stay put can move — dissolving in water, softening with heat or diffusing through a plasticiser — and travels across a surface, through to the back, or onto something touching it. Dyes are far more prone than pigments because they are dissolved rather than locked in a binder. Humidity and heat are the usual triggers: dye inkjet prints bleed in damp conditions, dye-sublimation prints with heat, and textiles with weak dye bonds in water.
A dye is held in place by its affinity for the substrate: ionic bonds in wool and silk, covalent bonds for reactive dyes on cotton, physical trapping for disperse dyes in polyester. Where that hold is weak, anything that can re-dissolve or mobilise the dye lets it move. Water is the commonest, which is why textile fastness testing separates washing, rubbing and perspiration from light. Heat raises the mobility of dye molecules in polymers and can let some dyes sublime; plasticisers and oils can carry colourants through a plastic or paint film. Pigments are much less prone because they are insoluble particles in a binder, although partly soluble pigments and fine dye-like organics can still migrate into a topcoat laid over them.
The Image Permanence Institute separates three forms in prints, and the categories work for most materials. Lateral bleed spreads colour sideways across the surface, blurring lines and producing coloured fringes. Bleed-through carries colour down through the material, sometimes to the reverse. Transfer moves colour onto whatever is in contact — the back of the next print in a stack, the facing page of an album, an envelope or a garment. In prints, IPI finds dye inkjet the most susceptible, pigment inkjet much less so, dye-sublimation prints vulnerable to heat and electrophotographic prints not bleeding. In textiles, the same patterns appear as dye running into white areas, staining of adjacent fabric in a wash, and colour rubbing off onto skin or upholstery.
Wash fastness depends on how the dye is bound. Direct dyes on cotton are held only by weak physical forces and have poor wash fastness, whereas reactive dyes form covalent bonds with the fibre and perform far better. Deep shades carry more dye, so any unfixed dye makes a bigger mark, which is why dark reds, navies and blacks are the traditional culprits in mixed washes. For historic textiles the stakes are higher: once dyes have bled, the staining is permanent. The Canadian Conservation Institute's guidance is simple on the outcome: if a textile shows any dye movement in a colourfastness check, it should not be wet-cleaned; if colours have already bled, it should never be washed.
Keeping relative humidity moderate and stable is the main defence for prints and dyed paper, together with avoiding heat sources and direct sun that warms surfaces. Interleaving with inert paper or storing prints separately prevents transfer between stacked items, and albums with facing prints should not be pressed together in warm, damp rooms. Water is the acute threat: a single wetting from a leak can ruin dye-based prints that would otherwise have lasted decades, which is why IPI publishes response guidance for flooded inkjet collections. In paint and coatings, migration is prevented at formulation stage by choosing non-bleeding pigments or blocking primers; for owners the practical sign is a stain or tint coming through a new pale topcoat, which a stain-blocking primer addresses.
| Material | Trigger | Risk | Notes |
|---|---|---|---|
| Dye inkjet print | Humidity, water, heat | High | Lateral bleed and transfer |
| Pigment inkjet print | Water | Lower | Much less prone than dye inks |
| Dye-sublimation print | Heat | Moderate | Heat can remobilise dyes |
| Electrophotographic (toner) print | — | Very low | Does not bleed |
| Direct-dyed cotton | Washing | High | Weakly bound dyes |
| Reactive-dyed cotton | Washing | Low | Covalently bound dyes |
| Historic textile that has already bled | Any wetting | Very high | Should never be washed |
Why: Dye transfer between prints in contact, accelerated by warmth and humidity.
Fix: Interleave with inert paper, store in a cool, dry room, and keep albums upright rather than stacked under weight.
Why: Unfixed dye from a red item in the same wash migrated in water.
Fix: Wash deep, new colours separately for the first few washes; stained fabric may not fully recover.
Each statement is labelled by kind — established fact, a standard’s requirement, observed market data, a convention, or Colourwise’s own interpretation or analysis — with the strength of the evidence behind it.
FactStrong evidence
Bleed is the undesired migration of colourants, occurring laterally across a print, through it (bleed-through) or onto adjacent surfaces (transfer); it is driven by high humidity or water and accelerated by heat, and dye inkjet prints are most susceptible while pigment inks are much less prone.
FactStrong evidence
If a textile shows colour movement at any point during a colourfastness test with water or detergent, it should not be washed.
FactModerate evidence
Direct dyes applied to cotton have poor wash fastness because they are held by weak physical forces, whereas reactive dyes bond covalently and give much better fastness.
Source: Colour fastness
FactStrong evidence
Dye-sublimation prints can bleed when exposed to high temperature, and electrophotographic prints do not bleed.
Reviewed 29 September 2026. Colourwise summarises its sources in its own words and does not reproduce standards text or proprietary colour data. Spotted an error? Tell us.