BLUES

Biro Blue

#2F3A46

RGB 47, 58, 70 · HSL 211°, 20%, 23% · CMYK 33, 17, 0, 73

Biro Blue is #2F3A46 in HEX — rgb(47, 58, 70), hsl(211°, 20%, 23%), cmyk(33%, 17%, 0%, 73%).

Biro Blue pulls into the deep end of the blues spectrum — HSL 211°, 20%, 23%. The muted saturation makes it quiet but present, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, home offices — for calm, focused environments. Reads best alongside warm white trim, oak or walnut, brass or matte black hardware.

Color Codes

HEX#2F3A46

RGB47, 58, 70

HSL211°, 20%, 23%

HSV211°, 33%, 27%

CMYK33, 17, 0, 73

Decimal3095110

CSS RGBrgb(47, 58, 70)

CSS HSLhsl(211, 20%, 23%)

Paint Matches — this color across 16 brands

Dulux

Biro Blue S38C9

Exact match

Vista Paint

In the Navy K-800

ΔE 1.4 · #313B45

Behr

Ink Black N490-7

ΔE 2.1 · #2F3E4A

Benjamin Moore

Polo 2062-10

ΔE 2.3 · #333B44

Sherwin-Williams

Naval SW6244

ΔE 2.4 · #2F3D4C

RAL

Granite Grey 7026

ΔE 4.7 · #2F353B

Dunn-Edwards

Old Mill DEA185

ΔE 5.2 · #343B4E

Hallman-Lindsay

Octavius 522

ΔE 5.5 · #38393F

Valspar

Twilight Purple 4010-2

ΔE 5.9 · #3E3B46

PPG

Wright Midnight FLLW36

ΔE 6.1 · #404149

Kilz

Night Magic RM230

ΔE 6.4 · #3C4348

Colorhouse

Nourish .06 Nourish-06

ΔE 7.9 · #313536

IKEA

IKEA163 163

ΔE 8.1 · #423A45

Farrow & Ball

Hague Blue 30

ΔE 8.8 · #3D4E57

Kobra

Blue 31

ΔE 8.9 · #334059

Dutch Boy

Seal of Grey VS-9301

ΔE 15.8 · #575757

Light Reflectance & Undertone

Light Reflectance Value (LRV)

4/100

Very Dark

0 · DarkLight · 100

Absorbs almost all light — dramatic and cocooning. Needs strong artificial lighting and works best as an accent or in well-lit rooms.

Undertone

TemperatureCool MasstoneBlue UndertoneViolet

Reads as a cool blue with a violet undertone showing through, especially in daylight. Pair trim and adjacent colours to either calm or amplify that undertone.

Color Theory

Complementary

#2F3A46

#463B2F

Analogous

#2F4646

#2F3A46

#2F2F46

Triadic

#2F3A46

#462F3A

#3A462F

Split-Complementary

#2F3A46

#462F2F

#46462F

Tetradic

#2F3A46

#462F46

#463B2F

#2F462F

Monochromatic

#0A0D0F

#101418

#2F3A46

#4E6074

#6F869F

Rectangle

#2F3A46

#3B2F46

#463B2F

#3A462F

Compound

#2F3A46

#2F2F46

#463B2F

#46462F

Variations

Lighter

#4E6176

#75899D

#B1BAC4

Darker

#252F39

#192027

#0E1317

Saturation

#373B3E

#2F3A46

#17395E

Interior Use

Best Rooms

bedrooms, bathrooms, home offices

Best Uses

main walls, ceilings, trim, cabinetry

Pairs With

warm white trim, oak or walnut, brass or matte black hardware

Accessibility (WCAG)

vs White

11.57:1

AAA

vs Black

1.81:1

Fail

Deuteranopia

#2F3A46

#333846

Original → Simulated

Protanopia

#2F3A46

#383845

Original → Simulated

Tritanopia

#2F3A46

#2E3C3A

Original → Simulated

Color Psychology

Focused · Cooling

Biro Blue lowers the temperature of a room — useful in south-facing rooms that overheat visually, and in home offices where you want a clear head. Pair with warm wood and brass to keep it from reading clinical.

SymbolismTrust, depth, stability

PersonalityClear-headed, dependable, contemplative

focustrustcalmofficebedroomdepth

How it looks under different light

#635850

Warm Bulb 2700K

Incandescent / soft white LED — pulls colour toward yellow/amber.

#2F3A46

Daylight 5500K

Midday natural light or daylight-spec LED — closest to the paint chip.

#505D74

Cool Bulb 6500K

Cool white LED / overcast daylight — pulls colour toward blue.

Pairs With

#EAEBEB

Trim

Matched off-white

Same hue at 92% lightness — trim reads coordinated, not stark.

#F7F7F8

Ceiling

Whisper tint

Near-white with a hint of the hero's undertone — ceiling feels intentional.

#3E3225

Accent

Complementary punch

Hue +180°, slightly muted for paint vs. screen — use on a door, frame, or single piece.

#574738

Floor

Walnut neutral

Warm mid-brown grounds the scheme regardless of hero hue.

Paint Info

Brand · Product Line

Benjamin Moore / Aura Interior (for richer color depth in deep tones)

Recommended Finishes

Matte (walls) · Pearl (trim) · Satin (doors)

Deep colors look best in matte — gloss exaggerates surface flaws. Reserve subtle sheen for trim, doors, and high-touch areas.

Best Surfaces

Accent walls · Doors · Cabinetry · Built-ins

Coverage & Dry Time

Typical coverage 350-400 sq ft per gallon over a primed surface.

Touch-dry in ~1 hour. Recoat after 4 hours. Full cure 7-14 days.

Primer

Tinted primer in a similar value is highly recommended — saves a coat and prevents the wall colour from washing the surface.

Application Tip

Use a 9" microfiber roller on walls and a 2.5" angled sash brush for trim cuts. Two coats minimum for even depth.

Paint Calculator

Wall area (m²)

Coats

Coverage (m² / L)

You'll need

4.0 litres

1.06 US gallons · room for one touch-up coat. Buy slightly more to ensure single-batch match.

Code Snippets

CSS — color

color: #2F3A46;

CSS — background

background-color: #2F3A46;

CSS Variable

--color-biro-blue: #2F3A46;

Tailwind v3 — config

colors: { 'biro-blue': '#2F3A46' }

Tailwind — arbitrary

bg-[#2F3A46] text-[#2F3A46]

SCSS

$biro-blue: #2F3A46;

Similar Colors

Polo Blue

#323A43 · ΔE 2.2

North Sea

#2B3B4C · ΔE 3.6

Deep Royal

#2F394B · ΔE 4.1

After Midnight

#33383E · ΔE 4.5

Soot

#373C41 · ΔE 5.2

Blackberry Punch

#3F4150 · ΔE 5.7

Old Navy

#2E3549 · ΔE 6.1

Deep Mulberry

#3C3845 · ΔE 6.2

Built by DSGN.HOUSE Updated 2026

Our color tools run on our own catalogue of 26,000+ real paint colors across 16 brands — Benjamin Moore, Sherwin-Williams, Behr, Dulux, RAL and more — with the color math (HSL and CIELAB matching) computed in-house, not scraped from summaries. Every color you pick maps to a real, buyable paint with its code, so what you see here you can actually take to the store. We review and update these tools and their data regularly.

Created by Denis Kataev, founder of DSGN.HOUSE — a software engineer and digital entrepreneur building professional color-design tools for everyone.

Frequently Asked Questions

What color is #2F3A46?

#2F3A46 is Biro Blue, a deep blue with a cool undertone.

Is #2F3A46 warm or cool?

Biro Blue reads cool, which influences how it interacts with surrounding tones and natural light.

What rooms work best with Biro Blue?

Biro Blue works well in bedrooms, bathrooms, home offices. Designers typically use it for main walls, ceilings, trim, cabinetry.

What colors pair well with Biro Blue?

Biro Blue pairs naturally with warm white trim, oak or walnut, brass or matte black hardware. Its complementary color is also a strong contrast option for accents.

Where can I download Biro Blue?

You can download Biro Blue on DSGN.HOUSE in 15 designer formats including CSS gradient, Figma, Procreate swatches, Tailwind config, Adobe ASE, SVG, and 4K wallpapers — all free.

What's the hex code for Biro Blue?

The hex code is #2F3A46. In RGB it's 47, 58, 70, and in HSL it's 211°, 20%, 23%.

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