#40231C Color

#40231C is rgb(64, 35, 28) in RGB, hsl(12, 39%, 18%) in HSL, and about cmyk(0%, 45%, 56%, 75%) in CMYK. It has no registered color name of its own — the closest is Bister (Bistre) (#3D2B1F), clearly related but distinguishable side by side at ΔE 6.61. White text is the more readable choice on this background.

#40231C

HEX#40231C

RGBrgb(64, 35, 28)

HSLhsl(12, 39%, 18%)

HSVhsv(12, 56%, 25%)

CMYKcmyk(0%, 45%, 56%, 75%)

OKLCHoklch(29.2% 0.047 34.4)

LABlab(17.53% 13.57 10.92)

LCHlch(17.53% 17.42 38.84)

What #40231C Is Called

Most hex codes have no name: there are 16.7 million of them and a few thousand registered names. These are the named colors nearest to #40231C, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Bister (Bistre)#3D2B1FΔE 6.61 Dark Sienna#3C1414ΔE 8.03 Zinnwaldite Brown#2C1608ΔE 8.13 Temptress#3C2126ΔE 8.5 Old Burgundy#43302EΔE 9.02 Root Beer#290E05ΔE 10.28

Browse the full index of named colors A-Z or every red in the library.

#40231C Channel Values

How #40231C breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

Model	Channels	Notes
RGB	R 64 · G 35 · B 28	8-bit channels as sent to the display
HSL	H 12° · S 39% · L 18%	Easiest model for building lighter and darker variants
HSV	H 12° · S 56% · V 25%	Matches the picker in most design tools
CMYK	C 0% · M 45% · Y 56% · K 75%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	14.24:1 vs white · 1.48:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #40231C background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

TextWhite text14.24:1AA normal AA large AAA normal

Fails AABlack text1.48:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #40231C in the contrast checker.

Colors That Go With #40231C

Pairings derived from color-wheel relationships. The complementary color sits opposite #40231C; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base

Complementary

Analogous

Analogous

Triadic

Triadic

Split comp.

Split comp.

Tints & Shades of #40231C

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

Shades

Want a full 50-950 ramp with semantic roles? Generate design tokens from #40231C.

How #40231C Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#40231C

Protanopia#2A2A1C

Protanomaly#34271C

Deuteranopia#2F2F1B

Deuteranomaly#362A1B

Tritanopia#402222

Tritanomaly#402320

Achromatopsia#2B2B2B

Test a full palette in the color blindness simulator.

Using #40231C in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--color-40231c: #40231C;

CSS backgroundbackground-color: #40231C;

Tailwind configcolors: { 'color-40231c': '#40231C' }

SwiftUIColor(red: 0.251, green: 0.137, blue: 0.110)

Android XML<color name="color_40231c">#40231C</color>

SVG fillfill="#40231C"

More Red Colors

#40231C sits in the red family. These are its neighbours across that family's full range, each with its own breakdown.

1f0000 fffafa 1f0005 fff5f5 1f0008 fff1f2 240000 fff1f0 240909 fff0f2 270707 ffedeb 4e0707 710f04 940000 a81c07 c0362c cdacac e30022 ee204d fa8072 ff1818 ff6467 ffb7c5

#40231C Frequently Asked Questions

What color is #40231C?

#40231C is a darkest red — rgb(64, 35, 28) in RGB and hsl(12, 39%, 18%) in HSL. It carries no registered color name of its own; the closest named color is Bister (Bistre) (#3D2B1F), which is clearly related but distinguishable side by side at a CIE76 distance of 6.61.

What is the RGB value of #40231C?

#40231C is rgb(64, 35, 28) — red 64, green 35, and blue 28 on the 0-255 scale.

What is the CMYK value of #40231C?

#40231C converts to approximately cmyk(0%, 45%, 56%, 75%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #40231C be black or white?

White text is the more readable choice. #40231C scores 14.24:1 against white and 1.48:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #40231C as a CSS color keyword?

No. #40231C is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is black (#000000) at a CIE76 distance of 24.71, which is visibly different.

Open #40231C in a Tool

Hex to RGB Hex to HSL Hex to CMYK Hex to OKLCH Hex to Pantone Build a palette Make a gradient

Keep exploring: every red in the color library, the guide to shades of red, or the full color library.