Undersea vs Grey Blue
Where Undersea belongs to Behr's range, Grey Blue is a RAL Classic color. Both sit in the blue-grey family, which is useful context if you're narrowing within a single hue direction. They have nearly identical light reflectance values (9 vs 7), so they'll read as similarly Dark in most lighting conditions. The ΔE 5.8 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Undersea vs Grey Blue in Real Spaces
2 real rooms side by side. Undersea and Grey Blue 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.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. The distinction reads clearly at room scale, making the choice between them concrete.
Color Details
Undersea vs Grey Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Undersea on one side and Grey Blue 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.
