Slippery Shale vs RAL 840-4
Slippery Shale (Behr) and RAL 840-4 (RAL Effect) come from different manufacturers. These are both greys, so the question isn't which hue to choose — it's where within grey to land. The 3-point LRV gap — 21 for RAL 840-4 vs 18 for Slippery Shale — means RAL 840-4 will open up a space more effectively. ΔE 4.2 means they're clearly different, but not dramatically so — they'd pair well in the same room. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Slippery Shale vs RAL 840-4 in Real Spaces
2 real rooms side by side. Slippery Shale and RAL 840-4 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.
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. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
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. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
Color Details
Slippery Shale vs RAL 840-4 Simulated Comparison
5 simulated room previews — drag the slider on each to see Slippery Shale on one side and RAL 840-4 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 Slippery Shale comparisons
See how Slippery Shale stacks up against other well-photographed colors across different brands and tones.
