Undersea vs Iron grey
Undersea is a Behr color while Iron grey comes from RAL Classic. These are both blue-greys, so the question isn't which hue to choose — it's where within blue-grey to land. At LRV 12 vs 9, Iron grey will read as the brighter of the two — a 3-point gap that matters most in north-facing or low-light rooms. At ΔE 3.3, the difference is perceptible but not dramatic — the two can work harmoniously in the same space. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Undersea vs Iron grey in Real Spaces
1 real room side by side. Undersea and Iron grey 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.
Front Door
Front doors are seen in isolation against the rest of the facade, which makes them a high-stakes surface where even subtle differences matter. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
Color Details
Undersea vs Iron grey Simulated Comparison
5 simulated room previews — drag the slider on each to see Undersea on one side and Iron 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 Undersea comparisons
See how Undersea stacks up against other well-photographed colors across different brands and tones.
