Plunge Pool vs Cast Iron
Plunge Pool is a PPG color while Cast Iron comes from Sherwin-Williams. These are both greys, so the question isn't which hue to choose — it's where within grey to land. With LRVs of 13 and 13, they'll behave almost identically in terms of how much light they reflect back into a room. With a ΔE of 1.9, the difference is subtle — you'd need them side by side to reliably tell them apart. Below you'll find 6 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Plunge Pool vs Cast Iron in Real Spaces
6 real rooms side by side. Plunge Pool and Cast Iron 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
Living rooms test a color across a full range of conditions — morning sun, afternoon shade, and evening lamp light all shift how both of these read. 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
Kitchen lighting tends to be bright and directional, which sharpens contrast and makes undertone differences more apparent. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Bathroom
Bathrooms amplify color — the enclosed space and reflective surfaces make what reads subtle elsewhere feel more present here. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Home Office
In a home office, wall color sits in your peripheral vision for hours at a time, so temperature and undertone matter more than you might expect. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Mudroom
A mudroom color needs to hold up under the most casual scrutiny: a glance as you're coming and going, often in mixed or artificial light. At this scale the difference is subtle — you'd need them side by side, as shown here, to reliably tell them apart.
House
At full exterior scale, the difference between these two colors becomes much easier to judge than from a small chip. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Color Details
Plunge Pool vs Cast Iron Simulated Comparison
5 simulated room previews — drag the slider on each to see Plunge Pool on one side and Cast Iron 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 Plunge Pool comparisons
See how Plunge Pool stacks up against other well-photographed colors across different brands and tones.
At LRV 69 vs 13, Ammonite is decisively the brighter choice.
White Dove reflects far more light (LRV 83 vs 13), opening up a space where Plunge Pool encloses it.
Plunge Pool reads slightly lighter (LRV 13 vs 6), a gap that shows most in low-lit rooms.
At LRV 52 vs 13, Purbeck Stone is decisively the brighter choice.
At LRV 30 vs 13, Evergreen Fog is decisively the brighter choice.
Mizzle reflects far more light (LRV 52 vs 13), opening up a space where Plunge Pool encloses it.
At LRV 60 vs 13, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 13), opening up a space where Plunge Pool encloses it.
Denim Drift reflects far more light (LRV 27 vs 13), opening up a space where Plunge Pool encloses it.
At LRV 43 vs 13, French Gray is decisively the brighter choice.
A 9-point LRV gap (13 vs 4) makes Plunge Pool the marginally brighter of the two.
Tranquil Dawn reflects far more light (LRV 55 vs 13), opening up a space where Plunge Pool encloses it.
With LRVs of 13 and 13, the two reflect almost the same amount of light.
Hardwick White reflects far more light (LRV 44 vs 13), opening up a space where Plunge Pool encloses it.
At LRV 84 vs 13, Pure White is decisively the brighter choice.
A 8-point LRV gap (21 vs 13) makes Artichoke the marginally brighter of the two.
Balboa Mist reflects far more light (LRV 66 vs 13), opening up a space where Plunge Pool encloses it.
Shoji White reflects far more light (LRV 74 vs 13), opening up a space where Plunge Pool encloses it.
Snowbound reflects far more light (LRV 83 vs 13), opening up a space where Plunge Pool encloses it.
At LRV 51 vs 13, Pigeon is decisively the brighter choice.
With LRVs of 13 and 12, the two reflect almost the same amount of light.
Plunge Pool reads slightly lighter (LRV 13 vs 8), a gap that shows most in low-lit rooms.
Skimming Stone reflects far more light (LRV 68 vs 13), opening up a space where Plunge Pool encloses it.
At LRV 41 vs 13, Dix Blue is decisively the brighter choice.
With LRVs of 13 and 12, the two reflect almost the same amount of light.
Saybrook Sage reflects far more light (LRV 45 vs 13), opening up a space where Plunge Pool encloses it.
At LRV 31 vs 13, Pale Green is decisively the brighter choice.