RAL 840-4 vs Studio Blue Green
Where RAL 840-4 belongs to RAL Effect's range, Studio Blue Green is a Sherwin-Williams color. Hue-wise, RAL 840-4 belongs to the grey family and Studio Blue Green to the blue-green family. They have nearly identical light reflectance values (21 vs 20), so they'll read as similarly Dark in most lighting conditions. The ΔE 8.0 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 840-4 vs Studio Blue Green in Real Spaces
4 real rooms side by side. RAL 840-4 and Studio Blue Green 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
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. 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.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. The distinction reads clearly at room scale, making the choice between them concrete.
House
Seen across an entire facade, subtle tonal differences become pronounced. What reads as nearly the same on a chip often reads as clearly different at scale. The distinction reads clearly at room scale, making the choice between them concrete.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. The distinction reads clearly at room scale, making the choice between them concrete.
Color Details
RAL 840-4 vs Studio Blue Green Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 840-4 on one side and Studio Blue Green 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 RAL 840-4 comparisons
See how RAL 840-4 stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 21, White Dove is decisively the brighter choice.
Purbeck Stone reflects far more light (LRV 52 vs 21), opening up a space where RAL 840-4 encloses it.
Evergreen Fog reads slightly lighter (LRV 30 vs 21), a gap that shows most in low-lit rooms.
Agreeable Gray reflects far more light (LRV 60 vs 21), opening up a space where RAL 840-4 encloses it.
At LRV 58 vs 21, Accessible Beige is decisively the brighter choice.
A 6-point LRV gap (27 vs 21) makes Denim Drift the marginally brighter of the two.
French Gray reflects far more light (LRV 43 vs 21), opening up a space where RAL 840-4 encloses it.
At LRV 55 vs 21, Tranquil Dawn is decisively the brighter choice.
At LRV 44 vs 21, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 21), opening up a space where RAL 840-4 encloses it.
At LRV 66 vs 21, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 21, Shoji White is decisively the brighter choice.
A 10-point LRV gap (21 vs 12) makes RAL 840-4 the marginally brighter of the two.
At LRV 68 vs 21, Skimming Stone is decisively the brighter choice.
A 10-point LRV gap (21 vs 12) makes RAL 840-4 the marginally brighter of the two.
At LRV 45 vs 21, Saybrook Sage is decisively the brighter choice.
Pale Green reads slightly lighter (LRV 31 vs 21), a gap that shows most in low-lit rooms.
RAL 840-4 reflects far more light (LRV 21 vs 7), opening up a space where Pine Needle encloses it.
With LRVs of 24 and 21, the two reflect almost the same amount of light.
Guilford Green reflects far more light (LRV 57 vs 21), opening up a space where RAL 840-4 encloses it.