#00040A Color

#00040A is rgb(0, 4, 10) in RGB, hsl(216, 100%, 2%) in HSL, and about cmyk(100%, 60%, 0%, 96%) in CMYK. It has no registered color name of its own — the closest is Black (#000000), very hard to tell apart at ΔE 2.87. White text is the more readable choice on this background.

#00040A

HEX#00040A

RGBrgb(0, 4, 10)

HSLhsl(216, 100%, 2%)

HSVhsv(216, 100%, 4%)

CMYKcmyk(100%, 60%, 0%, 96%)

OKLCHoklch(10.2% 0.024 242.2)

LABlab(0.95% -0.46 -2.67)

LCHlch(0.95% 2.71 260.15)

What #00040A 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 #00040A, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Black#000000ΔE 2.87 Vampire Black#080808ΔE 2.98 Rich Black#010B13ΔE 3.03 Vantablack#000100ΔE 3.05 Jet Black#0A0A0AΔE 3.25 Registration Black#000200ΔE 3.3

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

#00040A Channel Values

How #00040A 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 0 · G 4 · B 10	8-bit channels as sent to the display
HSL	H 216° · S 100% · L 2%	Easiest model for building lighter and darker variants
HSV	H 216° · S 100% · V 4%	Matches the picker in most design tools
CMYK	C 100% · M 60% · Y 0% · K 96%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	20.55:1 vs white · 1.02:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #00040A 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 text20.55:1AA normal ✓AA large ✓AAA normal ✓

TextBlack text1.02:1AA normal ✗AA large ✗AAA normal ✗

Need a specific ratio against another background? Open #00040A in the contrast checker.

Colors That Go With #00040A

Pairings derived from color-wheel relationships. The complementary color sits opposite #00040A; 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 #00040A

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

#00040A

#00060F

#000814

Want a full 50-950 ramp with semantic roles? Generate design tokens from #00040A.

How #00040A 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#00040A

Protanopia#03030A

Protanomaly#02040A

Deuteranopia#03030A

Deuteranomaly#02030A

Tritanopia#000505

Tritanomaly#000407

Achromatopsia#040404

Test a full palette in the color blindness simulator.

Using #00040A in Code

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

CSS custom property--color-00040a: #00040A;

CSS backgroundbackground-color: #00040A;

Tailwind configcolors: { 'color-00040a': '#00040A' }

SwiftUIColor(red: 0.000, green: 0.016, blue: 0.039)

Android XML<color name="color_00040a">#00040A</color>

SVG fillfill="#00040A"

More Blue Colors

#00040A sits in the bluefamily. These are its neighbours across that family's full range, each with its own breakdown.

000024 fafaff 00002e f9fafb 000033 f8fafc 000038 f8f8ff 000042 f5faff 000047 f5f5ff 001c3d 0078e0 0f0fff 1c398e 297eff 372a89 4e3cc3 648bbe 7b68ee 9999cc b8e6fe d6d6ff

#00040A Frequently Asked Questions

What color is #00040A?

#00040A is a darkest blue — rgb(0, 4, 10) in RGB and hsl(216, 100%, 2%) in HSL. It carries no registered color name of its own; the closest named color is Black (#000000), which is very hard to tell apart at a CIE76 distance of 2.87.

What is the RGB value of #00040A?

#00040A is rgb(0, 4, 10) — red 0, green 4, and blue 10 on the 0-255 scale.

What is the CMYK value of #00040A?

#00040A converts to approximately cmyk(100%, 60%, 0%, 96%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #00040A be black or white?

White text is the more readable choice. #00040A scores 20.55:1 against white and 1.02:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #00040A as a CSS color keyword?

No. #00040A 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 2.87, which is very hard to tell apart.

Open #00040A 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 blue in the color library, the guide to shades of blue, or the full color library.