BLUES

Prophetic Sea

#818B9C

RGB 129, 139, 156 · HSL 218°, 12%, 56% · CMYK 17, 11, 0, 39

Prophetic Sea is #818B9C in HEX — rgb(129, 139, 156), hsl(218°, 12%, 56%), cmyk(17%, 11%, 0%, 39%).

Prophetic Sea pulls into the mid-tone end of the blues spectrum — HSL 218°, 12%, 56%. The neutral saturation makes it near-neutral and forgiving, 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#818B9C

RGB129, 139, 156

HSL218°, 12%, 56%

HSV218°, 17%, 61%

CMYK17, 11, 0, 39

Decimal8489884

CSS RGBrgb(129, 139, 156)

CSS HSLhsl(218, 12%, 56%)

Paint Matches — this color across 16 brands

PPG

Prophetic Sea 1042-5

Exact match

Behr

River Tour PPU15-8

ΔE 1.3 · #838B9A

Dulux

Salon Bleu S40B4

ΔE 1.7 · #7D8797

Benjamin Moore

Irises 1440

ΔE 1.8 · #858A9B

Valspar

Window Screen 4004-4A

ΔE 1.9 · #7C8697

Sherwin-Williams

Dusty Heather SW9073

ΔE 2.7 · #8990A3

Vista Paint

Pale Orchid K-90

ΔE 3.6 · #7E889F

Kilz

Magical Twilight RB280-01

ΔE 3.9 · #7B8193

Dunn-Edwards

London Fog DE5920

ΔE 4.7 · #8D95AA

Hallman-Lindsay

Slate Tint 520

ΔE 4.8 · #7A818D

Kobra

Grey 42

ΔE 5 · #889099

RAL

Telegrey 2 7046

ΔE 6.4 · #82898F

IKEA

IKEA088 88

ΔE 7.3 · #8B859D

Colorhouse

Water .05 Water-05

ΔE 8.4 · #82979D

Farrow & Ball

Stone Blue 86

ΔE 8.8 · #7997A1

Dutch Boy

Natural Gray VS-9332

ΔE 10.3 · #878787

Light Reflectance & Undertone

Light Reflectance Value (LRV)

26/100

Medium

0 · DarkLight · 100

Balanced reflectance — holds colour without washing out. Versatile for most rooms and the most forgiving range for true-to-chip results.

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

#818B9C

#9C9281

Analogous

#81999C

#818B9C

#85819C

Triadic

#818B9C

#9C818B

#8B9C81

Split-Complementary

#818B9C

#9C8581

#999C81

Tetradic

#818B9C

#9C8199

#9C9281

#819C85

Monochromatic

#3A404A

#5C6575

#818B9C

#ACB3BE

#D7DAE0

Rectangle

#818B9C

#92819C

#9C9281

#8B9C81

Compound

#818B9C

#85819C

#9C9281

#999C81

Variations

Lighter

#9AA2B0

#B5BAC3

#D4D7DB

Darker

#646E81

#444C59

#272C34

Saturation

#8B8E93

#818B9C

#507ECE

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

3.44:1

AA Large

vs Black

6.11:1

Deuteranopia

#818B9C

#84899D

Original → Simulated

Protanopia

#818B9C

#89899A

Original → Simulated

Tritanopia

#818B9C

#808E8C

Original → Simulated

Color Psychology

Focused · Cooling

Prophetic Sea 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

#A09590

Warm Bulb 2700K

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

#818B9C

Daylight 5500K

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

#8D9AB4

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.

#F7F7F7

Ceiling

Whisper tint

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

#98815B

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 · Trim · Soft furniture

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: #818B9C;

CSS — background

background-color: #818B9C;

CSS Variable

--color-prophetic-sea: #818B9C;

Tailwind v3 — config

colors: { 'prophetic-sea': '#818B9C' }

Tailwind — arbitrary

bg-[#818B9C] text-[#818B9C]

SCSS

$prophetic-sea: #818B9C;

Similar Colors

Irises

#84899A · ΔE 1.8

Oxford Gray

#8290A0 · ΔE 2.2

Flower Box

#8690A4 · ΔE 2.6

Faded Violet

#8D8FA1 · ΔE 3.7

Bachelor Blue

#758391 · ΔE 4.2

Mineral Alloy

#81909B · ΔE 4.2

Wild Blue Yonder

#798E99 · ΔE 5.4

Chiswell Blue

#81929B · ΔE 5.7

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 #818B9C?

#818B9C is Prophetic Sea, a mid-tone blue with a cool undertone.

Is #818B9C warm or cool?

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

What rooms work best with Prophetic Sea?

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

What colors pair well with Prophetic Sea?

Prophetic Sea 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 Prophetic Sea?

You can download Prophetic Sea 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 Prophetic Sea?

The hex code is #818B9C. In RGB it's 129, 139, 156, and in HSL it's 218°, 12%, 56%.

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