How do cotton, linen and wool affect a colour?
These fabrics scatter light diffusely rather than reflecting it in one direction, so colour reads close to a flat, true reading with little added shine — a reliable way to judge a colour's real depth and saturation.
Heathered wool yarn is spun from fibres of more than one colour, which is why it reads as a soft, complex grey-brown rather than one flat tone — useful to know when trying to match it to a single paint or fabric colour.
Photo: “Ribbing after blocking” by WordRidden, CC BY 2.0, via Wikimedia Commons.
CottonLinenWoolKnit
What it affects
- Colour saturation shift
- Perceived depth
Practical advice
Because these fabrics show colour relatively 'honestly', they're a good choice for comparing a shortlist of colours against each other.
Always confirm with the physical garment under real light before committing to a colour choice — see methodology.
Related terms
Sources
- Colourwise editorial synthesis — Colourwise
Why it looks the way it does
Cotton, linen and wool are made of short, irregular staple fibres twisted into yarn, so the surface is a jumble of tiny curved faces pointing every way. Light striking it is reflected in all directions at once, and only a small share leaves as surface glare; most enters the dyed fibres, is absorbed selectively and scatters back out carrying the dye's colour. That diffuse, glare-free return is why these cloths look the same from most angles and why their colour looks close to the dye's own. Wool adds a scaly fibre surface and air-filled loft, which softens the colour a little further.
Wear and care: Abrasion raises broken fibre ends (pilling and fuzz) that add a whitish haze, and repeated washing and sunlight gradually fade dyes — so older natural-fibre garments usually look lighter and greyer than new ones.
What changes it
- Yarn and weave: a tight, smooth cotton poplin reflects a little more glare than a loose linen or brushed flannel
- Wetness — water fills the gaps between fibres, cuts internal scattering and makes the colour look darker
- Lamp type, since dyes that match in daylight can separate under warm or LED light
Common mistakes
- Comparing a new swatch with a garment that has been washed dozens of times
- Matching two natural fabrics in a shop and not checking them again at home under different lighting
Try this
- Use a plain cotton or wool item as your reference when comparing a shortlist of colours
- Compare swatches dry: dampness alone can make one look deeper than another
Read more
Sources: Wool; Generalization of Lambert's reflectance model (SIGGRAPH '94)