Astronomical vs Grey Blue
Astronomical is a Behr color while Grey Blue comes from RAL Classic. Hue-wise, Astronomical belongs to the grey family and Grey Blue to the blue-grey family. With LRVs of 7 and 7, they'll behave almost identically in terms of how much light they reflect back into a room. At ΔE 7.0, 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.
Astronomical vs Grey Blue in Real Spaces
1 real room side by side. Astronomical 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
Bedroom walls are often seen under warm artificial light, a context that shifts both colors from how they look on a chip. Side by side like this, the difference is easy to read — which is exactly why seeing them in a real space is more useful than comparing chips.
Color Details
Astronomical vs Grey Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Astronomical 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 Astronomical comparisons
See how Astronomical stacks up against other well-photographed colors across different brands and tones.
