Mysterious vs RAL 820-6
Mysterious (Benjamin Moore) and RAL 820-6 (RAL Effect) come from different manufacturers. These are both blue-greys, so the question isn't which hue to choose — it's where within blue-grey to land. Their light reflectance values are nearly the same — 9 vs 7 — so neither will read significantly brighter or darker than the other. A ΔE of 1.1 puts them in subtle territory — distinguishable in direct comparison, less so from across a room. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Mysterious vs RAL 820-6 in Real Spaces
4 real rooms side by side. Mysterious and RAL 820-6 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.
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. At this scale the difference is subtle — you'd need them side by side, as shown here, to reliably tell them apart.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. In photos like these you're seeing the difference at its most direct. In a finished room, the distinction is there but not dramatic.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. In photos like these you're seeing the difference at its most direct. In a finished room, the distinction is there but not dramatic.
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. In photos like these you're seeing the difference at its most direct. In a finished room, the distinction is there but not dramatic.
Color Details
Mysterious vs RAL 820-6 Simulated Comparison
5 simulated room previews — drag the slider on each to see Mysterious on one side and RAL 820-6 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 Mysterious comparisons
See how Mysterious stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 9, White Dove is decisively the brighter choice.
Ammonite reflects far more light (LRV 69 vs 9), opening up a space where Mysterious encloses it.
A 3-point LRV gap (9 vs 6) makes Mysterious the marginally brighter of the two.
Purbeck Stone reflects far more light (LRV 52 vs 9), opening up a space where Mysterious encloses it.
Evergreen Fog reflects far more light (LRV 30 vs 9), opening up a space where Mysterious encloses it.
At LRV 52 vs 9, Mizzle is decisively the brighter choice.
Agreeable Gray reflects far more light (LRV 60 vs 9), opening up a space where Mysterious encloses it.
At LRV 58 vs 9, Accessible Beige is decisively the brighter choice.
At LRV 27 vs 9, Denim Drift is decisively the brighter choice.
French Gray reflects far more light (LRV 43 vs 9), opening up a space where Mysterious encloses it.
Mysterious reads slightly lighter (LRV 9 vs 4), a gap that shows most in low-lit rooms.
At LRV 55 vs 9, Tranquil Dawn is decisively the brighter choice.
A 5-point LRV gap (13 vs 9) makes Bancha the marginally brighter of the two.
At LRV 44 vs 9, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 9), opening up a space where Mysterious encloses it.
Artichoke reflects far more light (LRV 21 vs 9), opening up a space where Mysterious encloses it.
At LRV 66 vs 9, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 9, Shoji White is decisively the brighter choice.
At LRV 83 vs 9, Snowbound is decisively the brighter choice.
A 3-point LRV gap (12 vs 9) makes Pewter Green the marginally brighter of the two.
At LRV 68 vs 9, Skimming Stone is decisively the brighter choice.
Dix Blue reflects far more light (LRV 41 vs 9), opening up a space where Mysterious encloses it.
Calamine reflects far more light (LRV 68 vs 9), opening up a space where Mysterious encloses it.
Treron reflects far more light (LRV 25 vs 9), opening up a space where Mysterious encloses it.
A 3-point LRV gap (12 vs 9) makes Vintage Vogue the marginally brighter of the two.
At LRV 45 vs 9, Saybrook Sage is decisively the brighter choice.
Pale Green reflects far more light (LRV 31 vs 9), opening up a space where Mysterious encloses it.
With LRVs of 9 and 7, the two reflect almost the same amount of light.
Cement grey reflects far more light (LRV 24 vs 9), opening up a space where Mysterious encloses it.
Guilford Green reflects far more light (LRV 57 vs 9), opening up a space where Mysterious encloses it.