Black grey vs Green Onyx
Black grey (RAL Classic) and Green Onyx (Sherwin-Williams) come from different manufacturers. Black grey reads as blue-grey, while Green Onyx reads as green-greige — two distinct hue families, not close cousins. The 25-point LRV gap — 31 for Green Onyx vs 6 for Black grey — means Green Onyx will open up a space more effectively. A ΔE of 44.8 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Black grey vs Green Onyx in Real Spaces
2 real rooms side by side. Seeing Black grey and Green Onyx in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Living Room
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. Green Onyx reflects noticeably more light off the walls, making the space read more open than Black grey.
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. Green Onyx returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Black grey vs Green Onyx Simulated Comparison
5 simulated room previews — drag the slider on each to see Black grey on one side and Green Onyx 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.
