NCS S 1540-B - Royal Blue
NCS S 1540-B (Royal Blue) is an NCS color with a HEX approximation of #4169E1, RGB 65, 105, 225, and CMYK 71/53/0/12. It has 15% blackness and 40% chromaticness with hue B. Its closest Pantone Solid Coated match is 2130 C (Delta E 4.84), and its closest NCS neighbor is S 2050-R60B (Medium Purple).
About NCS S 1540-B
NCS S 1540-B 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) · 15% blackness · 40% chromaticness · hue B.
Like every NCS code, S 1540-B is defined by a physical paint swatch in the NCS Color Atlas, not by a digital value. The HEX approximation #4169E1 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 1540-B is 2130 C (#5576D1), with a perceptual difference of Delta E 2000 = 4.84. This is a reasonable match but you should verify against physical Pantone chips before production.
Closest NCS neighbors
These NCS codes are perceptually closest to S 1540-B, sorted by Delta E 2000. Codes within the same family differ by Delta E 2-8 typically - siblings rather than duplicates.
Where NCS S 1540-B is used
NCS S 1540-B is typically specified in architectural facades, maritime and coastal applications, industrial machinery, and wayfinding systems. Its blue tone makes it appropriate wherever a technical, industrial, or nature-referencing palette is wanted. Before specifying NCS S 1540-B 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 1540-B in HEX?
NCS S 1540-B (Royal Blue) has a HEX approximation of #4169E1. 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; #4169E1 is close to every commonly-cited reference.
What does NCS S 1540-B mean?
The code breaks down as: S (Standard), 15% blackness, 40% chromaticness, hue B. 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 B 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 1540-B?
The closest Pantone Solid Coated match to NCS S 1540-B is 2130 C (#5576D1), with a perceptual difference of Delta E 2000 = 4.84. This is a reasonable match but you should verify against physical Pantone chips before production.
What NCS color is closest to NCS S 1540-B?
The closest NCS neighbors to S 1540-B are S 2050-R60B (Medium Purple, Delta E 14.4), S 2040-B (Bright Blue, Delta E 14.9), S 5040-B (Deep Blue, Delta E 19.1). Codes within the same family typically differ by Delta E 2-8 - siblings rather than duplicates.
Where is NCS S 1540-B commonly used?
NCS S 1540-B is typically used in architectural facades, maritime and coastal applications, industrial machinery, and wayfinding systems. Its blue tone makes it appropriate wherever a technical, industrial, or nature-referencing palette is wanted. Before specifying NCS S 1540-B for a production run, verify against a physical NCS color fan - the same code looks meaningfully different in different finishes.