Short answer
It depends on the tanning and the finish. Most leather is chrome-tanned, which leaves the hide pale grey-blue so it can be dyed any colour and often coated with pigment; such leather changes little. Vegetable-tanned leather is coloured by plant tannins — brown, red-brown or yellowish depending on the extract — and, like aniline leathers with no pigment layer, it darkens and warms with light, handling and oils into a patina. Suede and nubuck add a nap whose direction changes the shade.
Relative to other materials in this section, not a measurement of a particular product.
| Process | What you see | Driven by | Slowing it |
|---|---|---|---|
| Patina on vegetable-tanned and aniline leather | Darkening and warming, especially where handled | Light, oxidation of tannins, oils from skin | Accept as character, or choose pigmented leather |
| Fading of dyed leathers | Paler colour on sun-facing surfaces | Light on dyes | Keep out of direct sun; pigmented finishes |
Tanning stabilises the collagen in a hide so it does not rot. More than 85% of leather is tanned with chromium(III) salts, which leave the hide a pale greyish-blue — the 'wet blue' stage — ready to be dyed to almost any colour, including pale and bright ones. Vegetable tanning uses tannins extracted from bark, wood and fruit such as chestnut, quebracho and mimosa, and the extract sets the base colour: chestnut gives brown, quebracho a red-brown, purified extracts a paler yellow. Vegetable-tanned leather can be dyed, but its warm base colour shows through and limits how pale or cool it can go; undyed 'natural' veg-tan is a pale tan that is expected to change.
After dyeing, the finish decides what you see. Aniline leather is coloured only with transparent dyes that soak in, so the grain, pores, scars and variations in dye uptake all show; it looks deep and natural but marks, absorbs and fades easily. Semi-aniline adds a thin, lightly pigmented coat that evens the colour while keeping some grain character. Pigmented or corrected-grain leather is covered with an opaque, paint-like layer, often embossed with an artificial grain; it looks uniform, resists stains and light, and changes little with age. Waxed and pull-up leathers carry oils and waxes that lighten where the leather is stretched or folded, a deliberate effect.
Vegetable-tanned leather darkens and warms from pale tan towards honey and brown with exposure to light and air, and faster where it is handled, because oils from skin are absorbed and the tannins and other components oxidise. Aniline leathers show the same kind of change because there is no pigment layer to shield them. The result is the prized patina on saddles, belts and bags — and the uneven darkening that disappoints someone expecting a pale leather sofa to stay pale. Water and oils leave dark marks on unfinished leathers that may blend in with time or remain; a small test on the underside shows how a leather will respond.
Suede (split or flesh side) and nubuck (buffed grain side) have a short nap of fibres. Brushing the nap one way shows fibre tips and looks darker; the other way shows fibre sides and looks lighter, so these leathers 'write' when stroked, like velvet. Dyed leathers fade in sunlight, especially aniline finishes on furniture near windows, and faded areas are hard to restore without re-dyeing. Solvent cleaners can strip dye from aniline leather; pigmented leather can be cleaned and even re-coloured more easily because its colour is in the surface coat. When matching leather across a sofa or car interior, specify the finish type as well as the colour, since aniline and pigmented versions of one colour age apart.
Why: Oils from skin and light acting on an unprotected aniline finish.
Fix: Expect patina with aniline, or choose semi-aniline or pigmented leather for pale colours.
Why: Nap brushed in different directions.
Fix: Brush the nap in one direction with a suede brush.
Why: The original has aged; the new hide is fresh, and may be a different finish type.
Fix: Match finish type first, then colour to the aged original; allow the new panel to mellow.
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.
FactModerate evidence
Over 85% of leather products are tanned with chromium(III) salts.
Caveat: Industry-wide estimate cited in research literature; not an audited market count.
Source: Characterisation and tanning effects of purified chestnut and sulfited quebracho extracts (Collagen and Leather 6); Tanning (leather)
FactModerate evidence
In the raw state, chrome-tanned hides are greyish-blue and are called 'wet blue'.
Source: Tanning (leather)
FactModerate evidence
Vegetable tannin extracts give leather distinct colours: chestnut brown, quebracho red-brown, and purified extracts a paler yellow.
Colourwise interpretationLimited evidence
Vegetable-tanned and aniline leathers darken with light, air and handling, while pigment-finished leathers change much less because an opaque surface coat carries and protects the colour.
Based on: Widely reported leather-trade experience consistent with the photo-oxidation of plant polyphenols and the shielding effect of pigment layers; Colourwise has not located a controlled study comparing finishes.
Caveat: Rates vary greatly with tannin type, dye, light exposure and use.
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.