Iron Mountain → PPG
The closest PPG matches for Benjamin Moore Iron Mountain (2134-30), ranked by perceptual color distance.
Finding a PPG Equivalent for Iron Mountain
If you love Benjamin Moore Iron Mountain but need a PPG alternative, you are not alone. This is one of the most common cross-brand paint matching searches, whether you are working with a painter who prefers PPG, your local store does not carry Benjamin Moore, or you simply want to compare prices across brands before committing.
Iron Mountain (2134-30) is a dark gray with warm charcoal-green undertones. A dark, warm gray with subtle green undertones. Lighter than Wrought Iron, darker than Chelsea Gray. A versatile dark neutral. To find a good PPG match, we need a color that captures not just the right depth (LRV 14.79) but also that specific undertone character. That is where Delta E color science comes in.
We calculated the perceptual color distance between Iron Mountain and every PPG color using the CIE2000 Delta E formula, which measures how different two colors look to the human eye. A Delta E under 2 means most people cannot tell the colors apart. Between 2 and 4, you might notice a difference in certain lighting. Above 5, the difference is clearly visible side by side.
The good news: there is a strong PPG match for Iron Mountain. Porpoise Alt (PPG1010-5) comes in with a Delta E of 2.2, which puts it in the "excellent match" range. Porpoise Alt is the closest PPG option at LRV 16. Very close match.
PPG Matches for Iron Mountain
Porpoise Alt is the closest PPG option at LRV 16. Very close match.
| Iron Mountain | Porpoise Alt | |
|---|---|---|
| LRV | 14.79 | 16 |
| Hex | #767671 | #817E7A |
| Undertone | Warm Charcoal-Green | Warm Dark Ash |
| Family | Gray | Gray |
Undertone Comparison
Iron Mountain has warm charcoal-green undertones. A dark, warm gray with subtle green undertones. Lighter than Wrought Iron, darker than Chelsea Gray. A versatile dark neutral.
Porpoise Alt has warm dark ash undertones. A warm, dark ash gray. Between Up In Smoke and Thunderstorm. The warm brown gives it earthy character at a dark depth.
The undertone difference is worth paying attention to. While they are close in overall appearance, the different undertones mean they may diverge in certain lighting. Iron Mountain's warm charcoal-green quality may read differently than Porpoise Alt's warm dark ash character, especially in rooms with strong directional light or colored accents that could pull out one undertone more than the other. Test a sample in your specific room before committing.
How These Colors Behave in Different Lighting
Iron Mountain in Your Room
In bright light, the green lean is visible. In dim rooms, it reads as a solid dark gray. Works as a softer alternative to black.
Porpoise Alt in Your Room
Warm and grounding. In bright rooms, a warm dark gray. In dim rooms, approaching charcoal.
LRV and Brightness
Iron Mountain has an LRV of 14.79, while Porpoise Alt has an LRV of 16. These two colors reflect a very similar amount of light, so you should not notice a significant difference in room brightness when switching between them. The room will feel approximately the same in terms of light and space, which makes this a smoother transition.
Best Rooms for Iron Mountain
Benjamin Moore recommends Iron Mountain for: accent wall, exterior, front door, cabinets, office. With an LRV of 14.79, this is a dark color that absorbs more light than it reflects. It makes a bold statement and works beautifully on accent walls, front doors, exterior trim, and features where drama is the goal. In a full room, make sure you have good lighting and bright white trim for contrast.
Porpoise Alt is recommended for: accent wall, exterior, cabinets, office, front door. Both colors are recommended for similar applications, which confirms that this is a practical cross-brand match. You can use Porpoise Alt in the same rooms you planned for Iron Mountain.
Iron Mountain in Other Brands
Looking for Iron Mountain equivalents in other brands besides PPG? We have matches across all major paint brands.
Frequently Asked Questions
The closest PPG match for Iron Mountain (2134-30) is Porpoise Alt (PPG1010-5) with a Delta E of 2.2, which rates as a "excellent match" match. Porpoise Alt is the closest PPG option at LRV 16. Very close match. Delta E measures perceptual color distance on a scale where under 2 means nearly identical, 2 to 4 means close with subtle differences, and over 5 means clearly noticeable.
No, they are not identical. Iron Mountain is a Benjamin Moore color with warm charcoal-green undertones and an LRV of 14.79. Porpoise Alt is a PPG color with warm dark ash undertones and an LRV of 16. With a Delta E of 2.2, the difference is subtle and mainly visible in direct side-by-side comparison. Paint formulations differ between brands, so even colors with similar values can look slightly different due to pigment concentration, binders, and finish.
With a Delta E of 2.2, these colors are close enough to use in separate rooms of the same house without a jarring difference. However, avoid painting them on adjacent walls in the same room, as even subtle differences become apparent at a hard edge where two paints meet. For the smoothest result, use one brand consistently within each connected space and reserve the other brand for rooms that are visually separated.
There are several practical reasons to look for a PPG equivalent. Price differences between brands can be significant on large projects. Availability matters if your nearest paint store or home center specializes in PPG. Some painters have strong preferences for one brand's formula based on coverage, dry time, or workability. And if you are touching up existing PPG work, matching within the same brand gives you the best consistency for seamless results.
Match calculations use Delta E (CIE2000) computed from Lab color space conversion. Color data sourced from manufacturer specifications. Last reviewed: March 22, 2026.