What NCS is, and how it matches a paint colour

Hold a colour card against the wall and it looks right. Open the tin and it looks wrong. Matching a colour by eye fails for a reason: the light in the shop, the screen you saw it on, and your own memory each shift the shade. NCS removes the guesswork by turning a colour into a number that every mixer reads the same way.

What NCS is

NCS stands for the Natural Colour System, a Swedish standard used across Europe by paint makers, architects and decorators. It describes a colour by how the eye sees it, not by the pigments in the tin. NCS places every shade against six reference colours: white, black, yellow, red, blue and green. A teal sits part way between blue and green; a mustard sits between yellow and red.

How to read an NCS code

An NCS code looks like S 2030-Y90R. It packs three things into a short string:

• Blackness (the 20): how much black sits in the colour. Higher means darker.
• Chromaticness (the 30): how strong, or saturated, the colour is.
• Hue (the Y90R): where it sits between two reference colours. Y90R is a yellow carried 90% of the way towards red, so a deep orange.

A neutral grey drops the hue and reads as something like S 0500-N, where N marks it as having no colour cast. Once a shade has a code, any merchant with a tinting machine can mix it, in any base, in any country.

Why a code beats matching by eye

A colour changes with its light. A grey reads blue under a north window at midday and warm under a lamp at night. A phone screen adds its own cast, and no two screens agree. A swatch printed on paper reflects light differently from paint on plaster. An NCS value sidesteps all of that. It fixes the colour as a measurement, so the mix on your wall matches the one you chose, whatever lit the room when you picked it.

How DupeCoat uses NCS

DupeCoat reads the NCS value of a premium colour, finds the trade paint that matches that value, and scores how close the two sit. A score near 100 means the eye will not separate them on the wall. You search the designer colour, and the match comes back with the trade product and its price, mixed to the same measured value.

NCS, RAL and brand codes

A brand’s own name for a colour, like a heritage number on a Farrow & Ball card, tells a merchant nothing they can mix from. RAL, used on doors and metalwork, covers a fixed set of industrial colours rather than the full range a decorator wants. NCS describes any colour by its perception, which is why it carries between brands and bases. Give a mixer the NCS value and they can match a colour they have never seen.

Common questions

What does an NCS code look like?

A string such as S 2030-Y90R for a colour, or S 0500-N for a neutral. The numbers cover darkness and strength; the letters cover hue.

Is NCS the same as RAL or Pantone?

No. RAL and Pantone are fixed libraries of set colours. NCS is a system that can describe any colour by how the eye sees it, which makes it better suited to matching paint across brands.

Can any colour be matched to an NCS value?

Close to it. Most wall colours map onto an NCS value a merchant can mix. A few specialist finishes, like a metallic or a colour that shifts in the light, sit outside what a flat NCS value can hold.

Will the match be exact?

On colour, to the tolerance of the score shown against each match. A high score means the difference is smaller than the shift you already see between daylight and lamplight on the same wall.

Put a colour in to see its trade match in the dupe finder, or read how DupeCoat works.