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.
