Clam Shell vs Pewter Green
Where Clam Shell belongs to PPG's range, Pewter Green is a Sherwin-Williams color. Clam Shell reads as greige-grey, while Pewter Green reads as green-grey — two distinct hue families, not close cousins. Clam Shell (LRV 18) reflects noticeably more light than Pewter Green (LRV 12), a difference of 6 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 12.1, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 10 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Clam Shell vs Pewter Green in Real Spaces
10 real rooms side by side. Seeing Clam Shell and Pewter Green 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
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. The brightness difference is modest but present — Clam Shell gives the walls a little more lift.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. Clam Shell reads slightly lighter here — a subtle but real difference in how open the space feels.
Kitchen
In a kitchen, colors are seen under bright task lighting that amplifies undertones — what reads neutral elsewhere can show its hand here. Clam Shell reads slightly lighter here — a subtle but real difference in how open the space feels.
Dining Room
A dining room lit by a dimmed pendant or candles is one of the most forgiving environments for paint — warm light softens almost everything. Clam Shell has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
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. Clam Shell reads slightly lighter here — a subtle but real difference in how open the space feels.
Home Office
The test for a home office color isn't how it looks in a quick glance — it's whether it still feels right after a full day of work. Clam Shell reads slightly lighter here — a subtle but real difference in how open the space feels.
Mudroom
Mudrooms are seen in passing, often under whatever light comes through the door — a context that favors colors with some depth. Clam Shell has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
Patio
Outside, paint color competes with sky, landscaping, and direct sun — all of which shift how both of these read compared to an indoor chip. Clam Shell has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
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. Clam Shell reads slightly lighter here — a subtle but real difference in how open the space feels.
Front Door
A front door is a focal point — small color differences read clearly at this concentrated scale. The brightness difference is modest but present — Clam Shell gives the walls a little more lift.
Color Details
Clam Shell vs Pewter Green Simulated Comparison
5 simulated room previews — drag the slider on each to see Clam Shell on one side and Pewter 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 Clam Shell comparisons
See how Clam Shell stacks up against other well-photographed colors across different brands and tones.
At LRV 69 vs 18, Ammonite is decisively the brighter choice.
White Dove reflects far more light (LRV 83 vs 18), opening up a space where Clam Shell encloses it.
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.
At LRV 51 vs 18, Pigeon is decisively the brighter choice.
Clam Shell reads slightly lighter (LRV 18 vs 8), 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.
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.