Black grey vs Slate grey
Black grey and Slate grey come from the same RAL Classic collection. These are both blue-greys, so the question isn't which hue to choose — it's where within blue-grey to land. The 5-point LRV gap — 12 for Slate grey vs 6 for Black grey — means Slate grey will open up a space more effectively. A ΔE of 14.6 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 3 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Black grey vs Slate grey in Real Spaces
3 real rooms side by side. Seeing Black grey and Slate grey in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
House
A full exterior is the most demanding test for a paint color — scale and outdoor light both amplify differences that seem small on a swatch. Slate grey has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
Front Door
On a front door, the color is both the first and last thing you see — a context where even a modest tonal difference reads clearly. Slate grey reads slightly lighter here — a subtle but real difference in how open the space feels.
Kitchen Cabinets
Cabinet color is always seen in context — against countertops, backsplash, and hardware — which amplifies undertone differences that might disappear on a plain wall. Slate grey has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
Color Details
Black grey vs Slate grey Simulated Comparison
5 simulated room previews — drag the slider on each to see Black grey on one side and Slate 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 Black grey comparisons
See how Black grey stacks up against other well-photographed colors across different brands and tones.
