![NCS S 4030-R10B NCS S 4030-R10B](/images/ncs-s-4030-r10b/thumbnail.webp)
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The first number 40 indicates the blackness of the color, which is the percentage of black in the color.
NCS S 4040-R10B has 40% blackness.
The second number 40 indicates the chromaticness of the color, which is the percentage of colorfulness in the color.
It has 40% chromaticness.
The letter and number combination R10B indicates the hue of the color, which is the dominant wavelength of the color.
R10B means 10% blue in red, or a reddish-blue hue.
The final result is a dark, moderately saturated, reddish-blue color.