Iron Gate vs Sea Mariner
Both from Sherwin-Williams's palette. Hue-wise, Iron Gate belongs to the beige-greige family and Sea Mariner to the blue-grey family. Sea Mariner (LRV 7) reflects noticeably more light than Iron Gate (LRV 4), a difference of 3 points that becomes especially apparent in rooms with limited natural light. Iron Gate runs warm while Sea Mariner is decidedly cool, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 17.2, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Iron Gate vs Sea Mariner in Real Spaces
1 real room side by side. Seeing Iron Gate and Sea Mariner in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Mudroom
Mudrooms are seen in passing, often under whatever light comes through the door — a context that favors colors with some depth. Sea Mariner reads more restrained here, while Iron Gate adds a sense of enclosure and warmth.
Color Details
Iron Gate vs Sea Mariner Simulated Comparison
5 simulated room previews — drag the slider on each to see Iron Gate 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.