GREENS
Natural Indigo
#003740
Natural Indigo is #003740 in HEX — rgb(0, 55, 64), hsl(188°, 100%, 13%), cmyk(100%, 14%, 0%, 75%).
Natural Indigo pulls into the deep end of the greens spectrum — HSL 188°, 100%, 13%. The saturated saturation makes it bold and immediate, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, libraries — for grounding, restorative spaces. Reads best alongside soft white walls, oak floors, brass, warm clay accents.
Color Codes
Paint Matches — this color across 16 brands
RAL
Blue Green 6004
Dulux
Winter Waves S33B9
Benjamin Moore
Tucson 2056-10
Behr
Night Shade 740F-7
Sherwin-Williams
Dark Night SW6237
Vista Paint
Woodland Springs K-216
Hallman-Lindsay
Atlantic Waves 473
Dunn-Edwards
Deep Pine DEA180
PPG
Sailor's Coat 1153-7
Kilz
Oceans Deep TB-60
Dutch Boy
Dark Green D-6751
Valspar
Everglade Deck 5011-3
Colorhouse
Nourish .06 Nourish-06
Farrow & Ball
Hague Blue 30
IKEA
IKEA186 186
Kobra
Black 44
Light Reflectance & Undertone
Light Reflectance Value (LRV)
3/100
Very Dark
Absorbs almost all light — dramatic and cocooning. Needs strong artificial lighting and works best as an accent or in well-lit rooms.
Undertone
Reads as a cool teal with a green undertone showing through, especially in daylight. Pair trim and adjacent colours to either calm or amplify that undertone.
Color Theory
Complementary
Analogous
Triadic
Split-Complementary
Tetradic
Monochromatic
Rectangle
Compound
Variations
Lighter
Darker
Saturation
Interior Use
Best Rooms
bedrooms, bathrooms, libraries
Best Uses
main walls, cabinetry, soft furniture
Pairs With
soft white walls, oak floors, brass, warm clay accents
Accessibility (WCAG)
Deuteranopia
Protanopia
Tritanopia
Color Psychology
Calm · Restorative
Natural Indigo sits in the part of the spectrum the eye relaxes into. Designers reach for green when a room needs to feel like a refuge — bedrooms, libraries, bathrooms — because it lowers visual blood-pressure without flattening the space.
How it looks under different light
Pairs With
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
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
color: #003740;background-color: #003740;--color-natural-indigo: #003740;colors: { 'natural-indigo': '#003740' }bg-[#003740] text-[#003740]$natural-indigo: #003740;Similar Colors
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 #003740?
#003740 is Natural Indigo, a near-black green with a cool undertone.
Is #003740 warm or cool?
Natural Indigo reads cool, which influences how it interacts with surrounding tones and natural light.
What rooms work best with Natural Indigo?
Natural Indigo works well in bedrooms, bathrooms, libraries. Designers typically use it for main walls, cabinetry, soft furniture.
What colors pair well with Natural Indigo?
Natural Indigo pairs naturally with soft white walls, oak floors, brass, warm clay accents. Its complementary color is also a strong contrast option for accents.
Where can I download Natural Indigo?
You can download Natural Indigo 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 Natural Indigo?
The hex code is #003740. In RGB it's 0, 55, 64, and in HSL it's 188°, 100%, 13%.
