RAL Effect
RAL Effect 660-4
#3FB8CF
RAL Effect 660-4 is #3FB8CF in HEX, rgb(63, 184, 207), cmyk(70%, 11%, 0%, 19%).
RAL Effect 660-4, RAL Effect 660-4, is a cool color from the RAL Effect — the European standard used to specify exact colors for paints and coatings. Its hex value is #3FB8CF, or rgb(63, 184, 207). It's commonly specified for metallic and pearlescent finishes on vehicles, façades and design objects. 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 660-4 Color Codes
Paint Matches — RAL 660-4 across 16 brands
Light Reflectance & Undertone
Light Reflectance Value (LRV)
40/100
Medium
Balanced reflectance — holds colour without washing out. Versatile for most rooms and the most forgiving range for true-to-chip results.
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 Harmonies
Complementary
Analogous
Triadic
Monochromatic
Shades & Tints
Shades and tints of RAL Effect 660-4 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
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
RAL Effect 660-4 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 / 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
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: #3FB8CF;background-color: #3FB8CF;--color-ral-effect-660-4: #3FB8CF;colors: { 'ral-effect-660-4': '#3FB8CF' }bg-[#3FB8CF] text-[#3FB8CF]$ral-effect-660-4: #3FB8CF;Similar RAL Colors
About RAL 660-4
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 660-4 from the RAL Effect — 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 660-4 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 RAL Effect 660-4 equivalent across 16 brands (Benjamin Moore, Sherwin-Williams, Behr, Dulux and more), each with its code, so you can take RAL 660-4 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 660-4?
RAL 660-4 is RAL Effect 660-4. On screen it is approximately #3FB8CF (rgb 63, 184, 207).
What is RAL 660-4 in RGB?
RAL 660-4 is approximately rgb(63, 184, 207). Its HSL and CMYK values are in the color codes above.
What paint matches RAL 660-4?
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 660-4?
RAL 660-4 (RAL Effect 660-4) is approximately #3FB8CF in HEX — the standard sRGB equivalent for screen.
What is RAL 660-4 in CMYK?
RAL 660-4 converts to roughly cmyk(70%, 11%, 0%, 19%). 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.