NCS S 4010-Y90R - Sienna
NCS S 4010-Y90R (Sienna) is an NCS color with a HEX approximation of #A0522D, RGB 160, 82, 45, and CMYK 0/49/72/37. It has 40% blackness and 10% chromaticness with hue Y90R. Its closest Pantone Solid Coated match is 7586 C (Delta E 0.72), and its closest NCS neighbor is S 6005-Y50R (Brown).
About NCS S 4010-Y90R
NCS S 4010-Y90R is part of the Natural Color System, a perceptual color notation system developed in Sweden and widely used across Scandinavia and Northern Europe for architectural paint specifications. The code reads as: S (Standard) · 40% blackness · 10% chromaticness · hue Y90R.
Like every NCS code, S 4010-Y90R is defined by a physical paint swatch in the NCS Color Atlas, not by a digital value. The HEX approximation #A0522D is the most commonly-published translation, but physical NCS swatches are the only authoritative source. The full NCS Atlas contains roughly 1,950 codes; our reference covers 50 benchmark codes.
Closest Pantone match
The closest Pantone Solid Coated color to NCS S 4010-Y90R is 7586 C (#9E5330), with a perceptual difference of Delta E 2000 = 0.72. This is a very close match suitable for most print reproduction needs.
Closest NCS neighbors
These NCS codes are perceptually closest to S 4010-Y90R, sorted by Delta E 2000. Codes within the same family differ by Delta E 2-8 typically - siblings rather than duplicates.
Where NCS S 4010-Y90R is used
NCS S 4010-Y90R is typically specified in traditional building facades, natural-wood substitutes, and earth-toned architectural specifications. Its brown tone makes it appropriate wherever a refined, specialty, or decorative palette is wanted. Before specifying NCS S 4010-Y90R for a production run, verify the color against a physical NCS color fan under the actual lighting conditions and finish (matte, semi-gloss, gloss) that will be used - the same code looks meaningfully different across finishes.
Frequently asked questions
What is NCS S 4010-Y90R in HEX?
NCS S 4010-Y90R (Sienna) has a HEX approximation of #A0522D. This is the widely-published mid-range value - NCS is a perceptual color notation system, not a digital one, so any HEX representation is a translation rather than a definition. Different published sources disagree by 2-5% for the same NCS code; #A0522D is close to every commonly-cited reference.
What does NCS S 4010-Y90R mean?
The code breaks down as: S (Standard), 40% blackness, 10% chromaticness, hue Y90R. Blackness measures how much black the color contains relative to pure white (0%) and pure black (100%). Chromaticness measures how saturated the color is relative to a neutral gray at the same blackness. Hue Y90R specifies the position on the NCS perceptual color wheel - with Y for yellow, R for red, B for blue, G for green, or N for neutral.
What Pantone color is closest to NCS S 4010-Y90R?
The closest Pantone Solid Coated match to NCS S 4010-Y90R is 7586 C (#9E5330), with a perceptual difference of Delta E 2000 = 0.72. This is a very close match and is likely suitable for print reproduction.
What NCS color is closest to NCS S 4010-Y90R?
The closest NCS neighbors to S 4010-Y90R are S 6005-Y50R (Brown, Delta E 6.8), S 4050-R (Dark Red, Delta E 15.9), S 5502-Y (Khaki Brown, Delta E 16.1). Codes within the same family typically differ by Delta E 2-8 - siblings rather than duplicates.
Where is NCS S 4010-Y90R commonly used?
NCS S 4010-Y90R is typically used in traditional building facades, natural-wood substitutes, and earth-toned architectural specifications. Its brown tone makes it appropriate wherever a refined, specialty, or decorative palette is wanted. Before specifying NCS S 4010-Y90R for a production run, verify against a physical NCS color fan - the same code looks meaningfully different in different finishes.