BLUES

Coal Mine

#3D4B61

RGB 61, 75, 97 · HSL 217°, 23%, 31% · CMYK 37, 23, 0, 62

Coal Mine is #3D4B61 in HEX — rgb(61, 75, 97), hsl(217°, 23%, 31%), cmyk(37%, 23%, 0%, 62%).

Coal Mine pulls into the rich end of the blues spectrum — HSL 217°, 23%, 31%. 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#3D4B61

RGB61, 75, 97

HSL217°, 23%, 31%

HSV217°, 37%, 38%

CMYK37, 23, 0, 62

Decimal4016993

CSS RGBrgb(61, 75, 97)

CSS HSLhsl(217, 23%, 31%)

Paint Matches — this color across 16 brands

Behr

Coal Mine N540-7

Exact match

Dunn-Edwards

Luna Pier DE5888

ΔE 1.3 · #414D62

Dulux

Master S39C8

ΔE 1.6 · #3A4C61

Vista Paint

Into the Stratosphere C-626

ΔE 2.2 · #415065

PPG

Admiralty 1042-7

ΔE 2.3 · #404E61

Benjamin Moore

Jet CC-870

ΔE 2.3 · #424B63

Hallman-Lindsay

China Aster historic-china-aster

ΔE 2.5 · #444C60

Sherwin-Williams

Indigo Batik SW7602

ΔE 3.2 · #3E5063

Valspar

Indigo Streamer 4010-4

ΔE 4.5 · #404C5B

Kilz

Saxophone Solo RC290-02

ΔE 4.6 · #3F556C

Kobra

Blue 31

ΔE 5.2 · #334059

IKEA

IKEA122 122

ΔE 6.3 · #3A5170

Farrow & Ball

Stiffkey Blue 281

ΔE 8.1 · #4D5B6A

RAL

Slate Grey 7015

ΔE 8.9 · #434750

Colorhouse

Wool .06 Wool-06

ΔE 9.2 · #485761

Dutch Boy

Royal Blue D-6740

ΔE 13.9 · #1D375C

Light Reflectance & Undertone

Light Reflectance Value (LRV)

7/100

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

#3D4B61

#61533D

Analogous

#3D5D61

#3D4B61

#413D61

Triadic

#3D4B61

#613D4B

#4B613D

Split-Complementary

#3D4B61

#61413D

#5D613D

Tetradic

#3D4B61

#613D5D

#61533D

#3D6141

Monochromatic

#0A0C10

#1F2732

#3D4B61

#5A6F90

#8596B2

Rectangle

#3D4B61

#533D61

#61533D

#4B613D

Compound

#3D4B61

#413D61

#61533D

#5D613D

Variations

Lighter

#586C8D

#8191AA

#B8BFCB

Darker

#303C4F

#202936

#131820

Saturation

#4A4E55

#3D4B61

#1E4480

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

8.83:1

AAA

vs Black

2.38:1

Fail

Deuteranopia

#3D4B61

#414961

Original → Simulated

Protanopia

#3D4B61

#49495E

Original → Simulated

Tritanopia

#3D4B61

#3B4F4C

Original → Simulated

Color Psychology

Focused · Cooling

Coal Mine 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

#6D6564

Warm Bulb 2700K

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

#3D4B61

Daylight 5500K

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

#5A6A88

Cool Bulb 6500K

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

Pairs With

#EAEAEB

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.

#544732

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 / Regal Select Interior

Recommended Finishes

Eggshell (walls) · Pearl (trim) · Matte (ceiling)

Eggshell hides imperfections on main walls while keeping the color rich; pearl on trim adds subtle sheen and easier cleaning; flat matte on ceilings prevents glare.

Best Surfaces

Primary walls · Cabinetry · Doors · Mouldings

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

Standard primer is adequate.

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: #3D4B61;

CSS — background

background-color: #3D4B61;

CSS Variable

--color-coal-mine: #3D4B61;

Tailwind v3 — config

colors: { 'coal-mine': '#3D4B61' }

Tailwind — arbitrary

bg-[#3D4B61] text-[#3D4B61]

SCSS

$coal-mine: #3D4B61;

Similar Colors

Jet Blue

#414A62 · ΔE 2.3

Hudson Bay

#3F5266 · ΔE 3.5

Newburyport Blue

#465566 · ΔE 5.3

Washington Blue

#304656 · ΔE 5.8

Indi Go-Go

#445772 · ΔE 5.8

Approaching Storm

#4B4A5C · ΔE 6.0

Kensington Blue

#4B5A71 · ΔE 6.3

Evening Sky

#464956 · ΔE 6.7

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 #3D4B61?

#3D4B61 is Coal Mine, a deep blue with a cool undertone.

Is #3D4B61 warm or cool?

Coal Mine reads cool, which influences how it interacts with surrounding tones and natural light.

What rooms work best with Coal Mine?

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

What colors pair well with Coal Mine?

Coal Mine 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 Coal Mine?

You can download Coal Mine 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 Coal Mine?

The hex code is #3D4B61. In RGB it's 61, 75, 97, and in HSL it's 217°, 23%, 31%.

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