Iron Indigo (#184FA1)

The hex code for Iron Indigo is #184FA1. It is rgb(24, 79, 161) in RGB, hsl(216, 74%, 36%) in HSL, and about cmyk(85%, 51%, 0%, 37%) in CMYK — a dark blue. White text is the more readable choice on this background.

#184FA1

HEX#184FA1

RGBrgb(24, 79, 161)

HSLhsl(216, 74%, 36%)

HSVhsv(216, 85%, 63%)

CMYKcmyk(85%, 51%, 0%, 37%)

OKLCHoklch(44.2% 0.145 258.9)

LABlab(33.92% 7.44 -50.42)

LCHlch(33.92% 50.96 278.39)

Colors Closest to Iron Indigo

Iron Indigo is a registered color name. These are the named colors nearest to it, measured as CIE76 distance in CIELAB — a perceptual scale, so the ordering matches what the eye sees rather than how close the raw RGB numbers happen to sit.

Medium Electric Blue#035096ΔE 8.14 Denim#1560BDΔE 8.87 Green-blue#1164B4ΔE 10.05 Yinmn Blue#2E5090ΔE 10.94 Cobalt Blue#0047ABΔE 11.96 Sapphire#0F52BAΔE 12.81

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

#184FA1 Channel Values

How Iron Indigo 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 24 · G 79 · B 161	8-bit channels as sent to the display
HSL	H 216° · S 74% · L 36%	Easiest model for building lighter and darker variants
HSV	H 216° · S 85% · V 63%	Matches the picker in most design tools
CMYK	C 85% · M 51% · Y 0% · K 37%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	7.86:1 vs white · 2.67:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a Iron Indigo 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 text7.86:1AA normal ✓AA large ✓AAA normal ✓

TextBlack text2.67:1AA normal ✗AA large ✗AAA normal ✗

Need a specific ratio against another background? Open #184FA1 in the contrast checker.

Colors That Go With Iron Indigo

Pairings derived from color-wheel relationships. The complementary color sits opposite Iron Indigo; 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 Iron Indigo

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 #184FA1.

How Iron Indigo 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#184FA1

Protanopia#4949A1

Protanomaly#3B4BA1

Deuteranopia#4343A1

Deuteranomaly#3648A1

Tritanopia#005F5F

Tritanomaly#00597F

Achromatopsia#525252

Test a full palette in the color blindness simulator.

Using #184FA1 in Code

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

CSS custom property--iron-indigo: #184FA1;

CSS backgroundbackground-color: #184FA1;

Tailwind configcolors: { 'iron-indigo': '#184FA1' }

SwiftUIColor(red: 0.094, green: 0.310, blue: 0.631)

Android XML<color name="iron_indigo">#184FA1</color>

SVG fillfill="#184FA1"

More Blue Colors

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

190b65 182d3e 191632 181c20 191970 18187b 191980 173796 193cb8 172436 1974d2 162456 2499ff 3366ff 4682b4 5d94c0 7693ea 9186da add9ff cec8ef eeeefc 00009c 00549e 0769a6

#184FA1 Frequently Asked Questions

What is the hex code for Iron Indigo?

The hex code for Iron Indigo is #184FA1. That is rgb(24, 79, 161) in RGB, hsl(216, 74%, 36%) in HSL, and approximately cmyk(85%, 51%, 0%, 37%) in CMYK.

What is the RGB value of #184FA1?

#184FA1 is rgb(24, 79, 161) — red 24, green 79, and blue 161 on the 0-255 scale.

What is the CMYK value of #184FA1?

#184FA1 converts to approximately cmyk(85%, 51%, 0%, 37%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #184FA1 be black or white?

White text is the more readable choice. #184FA1 scores 7.86:1 against white and 2.67:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #184FA1 as a CSS color keyword?

No. #184FA1 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 darkslateblue (#483D8B) at a CIE76 distance of 16.35, which is visibly different.

Open Iron Indigo in a Tool

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