RAL Classic
RAL 5004 Black Blue
#18171C
RAL 5004 Black Blue is #18171C in HEX, rgb(24, 23, 28), cmyk(14%, 18%, 0%, 89%).
RAL 5004, Black Blue, is a cool color from the RAL Classic — the European standard used to specify exact colors for paints and coatings. Its hex value is #18171C, or rgb(24, 23, 28). It's commonly specified for machinery, signage, marine and industrial equipment. Below are its exact color codes (HEX, RGB, CMYK, HSL), the nearest real interior paints across 16 brands so you can match it on a wall, and similar RAL shades.
RAL 5004 Color Codes
Paint Matches — RAL 5004 across 16 brands
Light Reflectance & Undertone
Light Reflectance Value (LRV)
1/100
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
A near-neutral with a subtle cool violet undertone — it will pick up colour from surrounding surfaces and shift noticeably under different light.
Color Harmonies
Complementary
Analogous
Triadic
Monochromatic
Shades & Tints
Shades and tints of Black Blue run from a pale tint down to a deep shade — same hue and saturation, lightness stepped. Each rung below shows its exact HEX code; tap any to copy it.
Variations
Lighter
Darker
Saturation
Interior Use
Best Rooms
libraries, home offices, dramatic accents
Best Uses
doors, frames, hardware, accent walls
Pairs With
warm white walls, oak, brass, leather
Accessibility (WCAG)
Deuteranopia
Protanopia
Tritanopia
Color Psychology
Dramatic · Grounding
Black Blue reads as punctuation — it defines edges, draws a line under a room, and makes surrounding colors look more saturated. Use it sparingly on doors, frames, hardware, and the occasional accent wall.
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: #18171C;background-color: #18171C;--color-black-blue: #18171C;colors: { 'black-blue': '#18171C' }bg-[#18171C] text-[#18171C]$black-blue: #18171C;Similar RAL Colors
About RAL 5004
What is a RAL color?
RAL is the European color-matching standard used to specify exact colors for paints and coatings. Each code — like RAL 5004 from the RAL Classic — maps to one defined color, so a manufacturer or painter anywhere produces the identical result. It's used first and foremost on window frames, doors, façades, gates, railings and powder-coated metalwork.
Matching RAL 5004 on interior walls
RAL is defined for industrial coatings, not interior wall paint — so to paint a room in this color you match it to a real interior brand. The Paint Matches above show the nearest Black Blue equivalent across 16 brands (Benjamin Moore, Sherwin-Williams, Behr, Dulux and more), each with its code, so you can take RAL 5004 straight to a can.
More
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 RAL 5004?
RAL 5004 is Black Blue. On screen it is approximately #18171C (rgb 24, 23, 28).
What is RAL 5004 in RGB?
RAL 5004 is approximately rgb(24, 23, 28). Its HSL and CMYK values are in the color codes above.
What paint matches RAL 5004?
See “Paint Matches” above — it shows the nearest real paint in 16 brands (Benjamin Moore, Sherwin-Williams, Behr, Dulux and more) so you can paint a wall to match this RAL color.
What is the HEX code for RAL 5004?
RAL 5004 (Black Blue) is approximately #18171C in HEX — the standard sRGB equivalent for screen.
What is RAL 5004 in CMYK?
RAL 5004 converts to roughly cmyk(14%, 18%, 0%, 89%). For exact ink, confirm against a physical RAL fan deck.
Are RAL hex values exact?
They're the standard sRGB equivalent for screen. RAL is defined for physical coatings, so always confirm critical color against a physical RAL fan deck.