Sea Urchin 3 vs Cement grey
Sea Urchin 3 (Dulux) and Cement grey (RAL Classic) come from different manufacturers. Hue-wise, Sea Urchin 3 belongs to the blue family and Cement grey to the grey family. The 16-point LRV gap — 40 for Sea Urchin 3 vs 24 for Cement grey — means Sea Urchin 3 will open up a space more effectively. A ΔE of 19.5 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Sea Urchin 3 vs Cement grey in Real Spaces
2 real rooms side by side. Seeing Sea Urchin 3 and Cement grey in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Living Room
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. Sea Urchin 3 reflects noticeably more light off the walls, making the space read more open than Cement grey.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. Sea Urchin 3 returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Sea Urchin 3 vs Cement grey Simulated Comparison
5 simulated room previews — drag the slider on each to see Sea Urchin 3 on one side and Cement grey 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 Sea Urchin 3 comparisons
See how Sea Urchin 3 stacks up against other well-photographed colors across different brands and tones.
