Clam Shell vs Cement grey
Clam Shell (PPG) and Cement grey (RAL Classic) come from different manufacturers. Clam Shell reads as greige-grey, while Cement grey reads as grey — two distinct hue families, not close cousins. The 6-point LRV gap — 24 for Cement grey vs 18 for Clam Shell — means Cement grey will open up a space more effectively. ΔE 7.8 means they're clearly different, but not dramatically so — they'd pair well in the same room. Below you'll find 5 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Clam Shell vs Cement grey in Real Spaces
5 real rooms side by side. Clam Shell and Cement grey 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. Cement grey reads slightly lighter here — a subtle but real difference in how open the space feels.
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. Cement grey has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
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. Cement grey has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
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. Cement 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. Cement grey reads slightly lighter here — a subtle but real difference in how open the space feels.
Color Details
Clam Shell vs Cement grey Simulated Comparison
5 simulated room previews — drag the slider on each to see Clam Shell on one side and Cement 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 Clam Shell comparisons
See how Clam Shell stacks up against other well-photographed colors across different brands and tones.
White Dove reflects far more light (LRV 83 vs 18), opening up a space where Clam Shell encloses it.
At LRV 69 vs 18, Ammonite is decisively the brighter choice.
Clam Shell reflects far more light (LRV 18 vs 6), opening up a space where Iron Ore encloses it.
At LRV 52 vs 18, Purbeck Stone is decisively the brighter choice.
At LRV 30 vs 18, Evergreen Fog is decisively the brighter choice.
Mizzle reflects far more light (LRV 52 vs 18), opening up a space where Clam Shell encloses it.
At LRV 60 vs 18, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 18), opening up a space where Clam Shell encloses it.
Denim Drift reads slightly lighter (LRV 27 vs 18), a gap that shows most in low-lit rooms.
At LRV 43 vs 18, French Gray is decisively the brighter choice.
At LRV 18 vs 4, Clam Shell is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 18), opening up a space where Clam Shell encloses it.
Clam Shell reads slightly lighter (LRV 18 vs 13), a gap that shows most in low-lit rooms.
Hardwick White reflects far more light (LRV 44 vs 18), opening up a space where Clam Shell encloses it.
At LRV 84 vs 18, Pure White is decisively the brighter choice.
A 3-point LRV gap (21 vs 18) makes Artichoke the marginally brighter of the two.
Balboa Mist reflects far more light (LRV 66 vs 18), opening up a space where Clam Shell encloses it.
Shoji White reflects far more light (LRV 74 vs 18), opening up a space where Clam Shell encloses it.
Snowbound reflects far more light (LRV 83 vs 18), opening up a space where Clam Shell encloses it.
Clam Shell reads slightly lighter (LRV 18 vs 12), a gap that shows most in low-lit rooms.
Skimming Stone reflects far more light (LRV 68 vs 18), opening up a space where Clam Shell encloses it.
At LRV 41 vs 18, Dix Blue is decisively the brighter choice.
At LRV 68 vs 18, Calamine is decisively the brighter choice.
A 7-point LRV gap (25 vs 18) makes Treron the marginally brighter of the two.
Clam Shell reads slightly lighter (LRV 18 vs 12), a gap that shows most in low-lit rooms.
Saybrook Sage reflects far more light (LRV 45 vs 18), opening up a space where Clam Shell encloses it.
At LRV 31 vs 18, Pale Green is decisively the brighter choice.
A 11-point LRV gap (18 vs 7) makes Clam Shell the marginally brighter of the two.
At LRV 57 vs 18, Guilford Green is decisively the brighter choice.
At LRV 72 vs 18, Just Walnut is decisively the brighter choice.