Foundation
Six Elementary Colors
NCS is built on the idea that the human visual system recognizes six fundamental, "pure" sensations of color — colors that appear to contain no trace of any other. These six elementary colors are the building blocks from which every perceivable surface color can be described.
White and black form the achromatic axis. Yellow, red, blue, and green are the four chromatic elementary colors — each sitting 90° apart on the NCS Color Circle.
Important distinction: These are not the same as artist primaries (red, yellow, blue) or digital primaries (RGB). They reflect the six unique color experiences that neuroscience has identified in human color vision — based on opponent-process theory.
Structure
The NCS Color Space
All perceivable surface colors exist within a three-dimensional double cone — a precise geometric model that maps color relationships based on human perception.
White → Black
Vertical Axis
The central axis runs from white at the top to black at the bottom. Moving along this axis changes only the lightness of a color without introducing any hue.
Chromaticness
Radial Distance
Moving outward from the axis increases chromaticness — how vivid or saturated the color appears. Colors on the outer edge are the most chromatic (pure hue).
Hue
Circular Angle
Rotating around the axis changes the hue — the quality that makes a color look red, yellow, green, or blue — or any mixture in between.
A Double Cone
The full NCS Color Space takes the shape of a double cone — two cones joined at their widest point (the equator of maximum chromaticness). White sits at the top apex, black at the bottom.
Every color you can see on a surface corresponds to exactly one point inside this shape. Colors near the center axis are achromatic (grays). Colors near the outer surface are highly chromatic. The closer to an apex, the lighter or darker the color becomes.
Hue
The NCS Color Circle
The NCS Color Circle is a cross-section of the color space at its widest equator. It arranges all perceivable hues in a continuous ring, with the four chromatic elementary colors — Yellow, Red, Blue, and Green — placed 90° apart.
Any hue is described by its position between two adjacent elementary colors. For example, R20B means a hue that is 80% red and 20% blue — a deep rose.
Y
Pure yellow
Y50R
Half yellow, half red (orange)
R
Pure red
B50G
Half blue, half green (teal)
Nuance
The NCS Color Triangle
For every hue in the Color Circle, there is a corresponding NCS Color Triangle. This triangle shows all possible tonal variations of that hue — from near-white to near-black, and from pale to vivid.
Each point in the triangle is defined by two values: the degree of blackness (s) and the degree of chromaticness (c). The whiteness is implicit: w = 100 - s - c.
W
Maximum whiteness — pale, washed-out color
S
Maximum blackness — deep, dark shade
C
Maximum chromaticness — the purest, most vivid version
Each dot represents an NCS color plotted by its blackness (s) and chromaticness (c). Hover to see the code.
How to read it
The NCS Notation
Every NCS color is expressed as a compact code that encodes three independent properties: how dark, how vivid, and what hue. Click any segment to learn more.
Click a segment above to learn what it means
NCS S 0500-N
Almost white, neutral — 5% black, 0% chromatic, pure achromatic
NCS S 2060-B
Medium blue — 20% black, 60% chromatic, pure blue hue
NCS S 4550-Y80R
Dark warm brown — 45% black, 50% chromatic, mostly red with yellow
Why it exists
A Universal Language for Color
NCS was developed in Sweden over 50 years of research at the Scandinavian Colour Institute. Today it is the official color standard in Sweden, Norway, Spain, and South Africa — and used by professionals across 40+ countries.
Interior Design
Specify wall colors, furniture, and textiles with absolute precision — eliminating guesswork between designer, client, and painter.
Architecture
Coordinate facade and interior colors across materials, suppliers, and production batches over years of construction.
Manufacturing
Ensure color consistency across production runs, from automotive coatings to consumer product packaging.
Research & Education
A shared, device-independent language for studying color perception, psychology, and design principles.
Independent reference notice
NCS Home Color Explorer is an independent educational reference and is not affiliated with or endorsed by NCS Colour AB. NCS is a registered trademark of NCS Colour AB.
Digital color previews and conversion values on this site are approximations for screen planning and should be validated with official physical NCS samples for specification or procurement decisions.