RAL 820-6 vs Sea Mariner
RAL 820-6 is a RAL Effect color while Sea Mariner comes from Sherwin-Williams. Both sit in the blue-grey family, which is useful context if you're narrowing within a single hue direction. With LRVs of 7 and 7, they'll behave almost identically in terms of how much light they reflect back into a room. With a ΔE of 1.5, the difference is subtle — you'd need them side by side to reliably tell them apart. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
RAL 820-6 vs Sea Mariner in Real Spaces
1 real room side by side. RAL 820-6 and Sea Mariner 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.
Kitchen Cabinets
On cabinetry, undertone and temperature become more pronounced against countertops and hardware. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Color Details
RAL 820-6 vs Sea Mariner Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 820-6 on one side and Sea Mariner 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 RAL 820-6 comparisons
See how RAL 820-6 stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 7, White Dove is decisively the brighter choice.
Purbeck Stone reflects far more light (LRV 52 vs 7), opening up a space where RAL 820-6 encloses it.
Evergreen Fog reflects far more light (LRV 30 vs 7), opening up a space where RAL 820-6 encloses it.
Agreeable Gray reflects far more light (LRV 60 vs 7), opening up a space where RAL 820-6 encloses it.
At LRV 58 vs 7, Accessible Beige is decisively the brighter choice.
At LRV 27 vs 7, Denim Drift is decisively the brighter choice.
French Gray reflects far more light (LRV 43 vs 7), opening up a space where RAL 820-6 encloses it.
At LRV 55 vs 7, Tranquil Dawn is decisively the brighter choice.
At LRV 44 vs 7, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 7), opening up a space where RAL 820-6 encloses it.
At LRV 66 vs 7, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 7, Shoji White is decisively the brighter choice.
A 5-point LRV gap (12 vs 7) makes Pewter Green the marginally brighter of the two.
At LRV 68 vs 7, Skimming Stone is decisively the brighter choice.
A 5-point LRV gap (12 vs 7) makes Vintage Vogue the marginally brighter of the two.
At LRV 45 vs 7, Saybrook Sage is decisively the brighter choice.
Pale Green reflects far more light (LRV 31 vs 7), opening up a space where RAL 820-6 encloses it.
With LRVs of 7 and 7, the two reflect almost the same amount of light.
Cement grey reflects far more light (LRV 24 vs 7), opening up a space where RAL 820-6 encloses it.
Guilford Green reflects far more light (LRV 57 vs 7), opening up a space where RAL 820-6 encloses it.