NEUTRALS

Moonless Sky

#3A4040

RGB 58, 64, 64 · HSL 180°, 5%, 24% · CMYK 9, 0, 0, 75

Moonless Sky is #3A4040 in HEX — rgb(58, 64, 64), hsl(180°, 5%, 24%), cmyk(9%, 0%, 0%, 75%).

Moonless Sky pulls into the deep end of the neutrals spectrum — HSL 180°, 5%, 24%. The neutral saturation makes it near-neutral and forgiving, and the hue reads cool. In interior projects it shines on main walls, trims, ceilings — versatile across nearly any style. Reads best alongside soft whites, natural wood, matte black trim, linen.

Color Codes

HEX#3A4040

RGB58, 64, 64

HSL180°, 5%, 24%

HSV180°, 9%, 25%

CMYK9, 0, 0, 75

Decimal3817536

CSS RGBrgb(58, 64, 64)

CSS HSLhsl(180, 5%, 24%)

Paint Matches — this color across 16 brands

Vista Paint

Moonless Sky K-848

Exact match

Benjamin Moore

Blacktop 2135-10

ΔE 1.3 · #3A3E3D

Hallman-Lindsay

Dark River 494

ΔE 1.9 · #3E4445

Dulux

Domino SG6G8

ΔE 1.9 · #3C3E3F

Behr

Private Black N530-7

ΔE 1.9 · #363F41

RAL

Black Green 6012

ΔE 2.4 · #343E40

Dunn-Edwards

Dark Engine DE6350

ΔE 2.6 · #3E3F41

Kilz

True Black RM260A

ΔE 2.7 · #3D3D3D

PPG

Dark As Night 14-05

ΔE 2.7 · #3D4645

Sherwin-Williams

Greenblack SW6994

ΔE 2.7 · #373A3A

Colorhouse

Metal .06 Metal-06

ΔE 2.7 · #3F4647

Valspar

Nocturnal Green 5011-1

ΔE 2.9 · #414647

Farrow & Ball

Off-Black 57

ΔE 3.5 · #444546

Kobra

Black 44

ΔE 4.6 · #383737

IKEA

IKEA152 152

ΔE 6.6 · #494F50

Dutch Boy

Seal of Grey VS-9301

ΔE 10.8 · #575757

Light Reflectance & Undertone

Light Reflectance Value (LRV)

5/100

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

TemperatureNeutral MasstoneTeal UndertoneGreen

A near-neutral with a subtle neutral green undertone — it will pick up colour from surrounding surfaces and shift noticeably under different light.

Color Theory

Complementary

#3A4040

#403A3A

Analogous

#3A403D

#3A4040

#3A3D40

Triadic

#3A4040

#403A40

#40403A

Split-Complementary

#3A4040

#403A3D

#403D3A

Tetradic

#3A4040

#3D3A40

#403A3A

#3D403A

Monochromatic

#0C0D0D

#161818

#3A4040

#5E6868

#849090

Rectangle

#3A4040

#3A3A40

#403A3A

#40403A

Compound

#3A4040

#3A3D40

#403A3A

#403D3A

Variations

Lighter

#5F6969

#869090

#B9BEBE

Darker

#2E3434

#202424

#121515

Saturation

#3C3E3E

#3A4040

#1D5D5D

Interior Use

Best Rooms

living rooms, bedrooms, kitchens

Best Uses

main walls, trim, accents

Pairs With

soft whites, natural wood, brass, matte black trim

Accessibility (WCAG)

vs White

10.57:1

AAA

vs Black

1.99:1

Fail

Deuteranopia

#3A4040

#3E3E40

Original → Simulated

Protanopia

#3A4040

#3F3F40

Original → Simulated

Tritanopia

#3A4040

Original → Simulated

Color Psychology

Quiet · Versatile

Moonless Sky gets out of the way so the architecture and the people in the room do the work. The right neutral is never a default — it reads warm or cool, dusty or sharp depending on its undertone, and that undertone is what makes or breaks the room.

SymbolismBalance, sophistication, calm

PersonalityAdaptable, considered, timeless

versatileneutraltimelessbackdroptrimwall

How it looks under different light

#6B5D4B

Warm Bulb 2700K

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

#3A4040

Daylight 5500K

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

#58626F

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.

#F7F7F7

Ceiling

Whisper tint

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

#412727

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: #3A4040;

CSS — background

background-color: #3A4040;

CSS Variable

--color-moonless-sky: #3A4040;

Tailwind v3 — config

colors: { 'moonless-sky': '#3A4040' }

Tailwind — arbitrary

bg-[#3A4040] text-[#3A4040]

SCSS

$moonless-sky: #3A4040;

Similar Colors

Blacktop

#393D3C · ΔE 1.6

Midnight

#373D3F · ΔE 1.8

Black Panther

#3D3F40 · ΔE 1.9

Notre Dame

#404343 · ΔE 2.1

Regent Green

#364042 · ΔE 2.1

Black Iron

#3A3C3E · ΔE 2.6

Black Jack

#3D3D3E · ΔE 2.8

Ebony King

#383A3C · ΔE 3.2

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 #3A4040?

#3A4040 is Moonless Sky, a deep neutral with a cool undertone.

Is #3A4040 warm or cool?

Moonless Sky reads cool, which influences how it interacts with surrounding tones and natural light.

What rooms work best with Moonless Sky?

Moonless Sky works well in living rooms, bedrooms, kitchens. Designers typically use it for main walls, trim, accents.

What colors pair well with Moonless Sky?

Moonless Sky pairs naturally with soft whites, natural wood, brass, matte black trim. Its complementary color is also a strong contrast option for accents.

Where can I download Moonless Sky?

You can download Moonless Sky 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 Moonless Sky?

The hex code is #3A4040. In RGB it's 58, 64, 64, and in HSL it's 180°, 5%, 24%.

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