Mermaid Sea vs RAL 750-3
Where Mermaid Sea belongs to Behr's range, RAL 750-3 is a RAL Effect color. Hue-wise, Mermaid Sea belongs to the blue family and RAL 750-3 to the green family. They have nearly identical light reflectance values (13 vs 12), so they'll read as similarly Dark in most lighting conditions. The ΔE 8.0 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 5 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Mermaid Sea vs RAL 750-3 in Real Spaces
5 real rooms side by side. Mermaid Sea and RAL 750-3 are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Living Room
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. Side by side like this, the difference is easy to read — which is exactly why seeing them in a real space is more useful than comparing chips.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. The distinction reads clearly at room scale, making the choice between them concrete.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. The distinction reads clearly at room scale, making the choice between them concrete.
House
Seen across an entire facade, subtle tonal differences become pronounced. What reads as nearly the same on a chip often reads as clearly different at scale. The distinction reads clearly at room scale, making the choice between them concrete.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. The distinction reads clearly at room scale, making the choice between them concrete.
Color Details
Mermaid Sea vs RAL 750-3 Simulated Comparison
5 simulated room previews — drag the slider on each to see Mermaid Sea on one side and RAL 750-3 on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Mermaid Sea comparisons
See how Mermaid Sea stacks up against other well-photographed colors across different brands and tones.
Ammonite reflects far more light (LRV 69 vs 13), opening up a space where Mermaid Sea encloses it.
At LRV 83 vs 13, White Dove is decisively the brighter choice.
A 7-point LRV gap (13 vs 6) makes Mermaid Sea the marginally brighter of the two.
Purbeck Stone reflects far more light (LRV 52 vs 13), opening up a space where Mermaid Sea encloses it.
Evergreen Fog reflects far more light (LRV 30 vs 13), opening up a space where Mermaid Sea encloses it.
At LRV 52 vs 13, Mizzle is decisively the brighter choice.
Agreeable Gray reflects far more light (LRV 60 vs 13), opening up a space where Mermaid Sea encloses it.
At LRV 58 vs 13, Accessible Beige is decisively the brighter choice.
At LRV 27 vs 13, Denim Drift is decisively the brighter choice.
French Gray reflects far more light (LRV 43 vs 13), opening up a space where Mermaid Sea encloses it.
Mermaid Sea reads slightly lighter (LRV 13 vs 4), a gap that shows most in low-lit rooms.
At LRV 55 vs 13, Tranquil Dawn is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 13 vs 13), so neither reads brighter in a room.
At LRV 44 vs 13, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 13), opening up a space where Mermaid Sea encloses it.
Artichoke reads slightly lighter (LRV 21 vs 13), a gap that shows most in low-lit rooms.
At LRV 66 vs 13, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 13, Shoji White is decisively the brighter choice.
At LRV 83 vs 13, Snowbound is decisively the brighter choice.
Pigeon reflects far more light (LRV 51 vs 13), opening up a space where Mermaid Sea encloses it.
Their light reflectance is nearly identical (LRV 13 vs 12), so neither reads brighter in a room.
A 5-point LRV gap (13 vs 8) makes Mermaid Sea the marginally brighter of the two.
At LRV 68 vs 13, Skimming Stone is decisively the brighter choice.
Dix Blue reflects far more light (LRV 41 vs 13), opening up a space where Mermaid Sea encloses it.
Their light reflectance is nearly identical (LRV 13 vs 12), so neither reads brighter in a room.
At LRV 45 vs 13, Saybrook Sage is decisively the brighter choice.
Pale Green reflects far more light (LRV 31 vs 13), opening up a space where Mermaid Sea encloses it.