GREYS

Millstone

#6B726B

RGB 107, 114, 107 · HSL 120°, 3%, 43% · CMYK 6, 0, 6, 55

Millstone is #6B726B in HEX — rgb(107, 114, 107), hsl(120°, 3%, 43%), cmyk(6%, 0%, 6%, 55%).

Millstone pulls into the rich end of the greys spectrum — HSL 120°, 3%, 43%. The neutral saturation makes it near-neutral and forgiving, and the hue reads cool. In interior projects it shines on walls, soft furniture, hard surfaces — as the project's quiet backbone. Reads best alongside white trim, natural wood, brass, soft black accents.

Color Codes

HEX#6B726B

RGB107, 114, 107

HSL120°, 3%, 43%

HSV120°, 6%, 45%

CMYK6, 0, 6, 55

Decimal7041643

CSS RGBrgb(107, 114, 107)

CSS HSLhsl(120, 3%, 43%)

Paint Matches — this color across 16 brands

Benjamin Moore

Millstone 1581

Exact match

Hallman-Lindsay

Billowing Smoke 583

ΔE 1.4 · #6E726A

Vista Paint

Billowing Smoke C-582

ΔE 1.7 · #6B6F67

Behr

Heritage Park PPU12-18

ΔE 1.9 · #6A756D

Dulux

Hildegard SG5E5

ΔE 2.5 · #717772

Sherwin-Williams

Homburg Gray SW7622

ΔE 2.6 · #666D69

PPG

Gunmetal Gray 1033-6

ΔE 2.6 · #646C64

RAL

Mouse Grey 7005

ΔE 2.9 · #646B63

Dunn-Edwards

Velvet Clover DE6293

ΔE 2.9 · #656D63

Valspar

Quaking Bog 5005-2C

ΔE 3.2 · #666A63

Kilz

Old Key RL260

ΔE 3.6 · #696D6B

Farrow & Ball

Green Smoke 47

ΔE 4.7 · #737C70

IKEA

IKEA185 185

ΔE 6 · #7B7B79

Dutch Boy

Ashton Grey VS-9303

ΔE 6.1 · #66665A

Colorhouse

Wool .05 Wool-05

ΔE 9.1 · #587675

Kobra

Green 37

ΔE 13.3 · #515545

Light Reflectance & Undertone

Light Reflectance Value (LRV)

16/100

Dark

0 · DarkLight · 100

Soaks up light and feels moody and intimate. Great for studies, dining rooms and accent walls; pair with ample lighting.

Undertone

TemperatureNeutral MasstoneGreen UndertoneBlue

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

Color Theory

Complementary

#6B726B

#716A71

Analogous

#6E716A

#6B726B

#6A716E

Triadic

#6B726B

#6A6A71

#716A6A

Split-Complementary

#6B726B

#6E6A71

#716A6E

Tetradic

#6B726B

#6A6E71

#716A71

#716E6A

Monochromatic

#202220

#454A45

#6B726B

#919791

#B8BCB8

Rectangle

#6B726B

#6A7171

#716A71

#716A6A

Compound

#6B726B

#6A716E

#716A71

#716A6E

Variations

Lighter

#878E87

#A6AAA6

#CBCDCB

Darker

#555A55

#3A3E3A

#222422

Saturation

#6D6F6D

#6A716A

#35A635

Interior Use

Best Rooms

living rooms, bedrooms, bathrooms

Best Uses

walls, soft furniture, hard surfaces

Pairs With

white trim, natural wood, brass, soft black accents

Accessibility (WCAG)

vs White

4.95:1

vs Black

4.24:1

AA Large

Deuteranopia

#6B726B

#706F6C

Original → Simulated

Protanopia

#6B726B

#71716C

Original → Simulated

Tritanopia

#6B726B

#6C7171

Original → Simulated

Color Psychology

Quiet · Versatile

Millstone 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

#90826B

Warm Bulb 2700K

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

#6B726B

Daylight 5500K

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

#7D8790

Cool Bulb 6500K

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

Pairs With

#EAEBEA

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.

#754675

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: #6B726B;

CSS — background

background-color: #6B726B;

CSS Variable

--color-millstone: #6B726B;

Tailwind v3 — config

colors: { 'millstone': '#6B726B' }

Tailwind — arbitrary

bg-[#6B726B] text-[#6B726B]

SCSS

$millstone: #6B726B;

Similar Colors

Millstone Gray

#6A716A · ΔE 0.4

Gray Gardens

#717571 · ΔE 2.7

Amherst Gray

#757670 · ΔE 3.3

Caldwell Green

#627067 · ΔE 3.4

Rainy Afternoon

#646B61 · ΔE 3.4

Kitty Gray

#646B68 · ΔE 3.6

Quarry Rock

#616964 · ΔE 3.9

Rocky Coast

#6C7171 · ΔE 4.2

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 #6B726B?

#6B726B is Millstone, a mid-tone grey with a cool undertone.

Is #6B726B warm or cool?

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

What rooms work best with Millstone?

Millstone works well in living rooms, bedrooms, bathrooms. Designers typically use it for walls, soft furniture, hard surfaces.

What colors pair well with Millstone?

Millstone pairs naturally with white trim, natural wood, brass, soft black accents. Its complementary color is also a strong contrast option for accents.

Where can I download Millstone?

You can download Millstone 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 Millstone?

The hex code is #6B726B. In RGB it's 107, 114, 107, and in HSL it's 120°, 3%, 43%.

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