Cast Iron SW 6202 reads like the color of a storm cloud frozen in place. On the wall it is a deep, near-black charcoal, dark enough to command a room but never so flat that it feels like a simple black. That muted quality is what sets it apart: the base gray carries just enough color to give it dimension, so the result feels sleek and considered rather than blunt or harsh. At LRV 12.5 it reflects very little light, and that low reflectance is the whole point.
Lighting pulls this color in noticeably different directions. Flood it with bright natural light, especially south-facing sun, and Cast Iron softens ever so slightly, the undertones become more readable, and the shade feels almost approachable. Move into a dim hallway or a room with one north-facing window and it deepens into something velvety, intimate, and genuinely dramatic. Evening light under warm incandescent or Edison bulbs tends to push it warmer and richer. Because the shift across lighting conditions is real and meaningful, testing a large swatch on the actual wall across both daytime and evening light is not optional here. A small chip card will tell you almost nothing useful.
The official color family and our editorial read place Cast Iron firmly in the green-sage-gray camp, and in many rooms that is exactly what you will see: a muted, earthy green-gray with a hint of sage that keeps it from reading as a true neutral. It is the kind of undertone that makes the color feel connected to the natural world, a slate, a stone, a piece of weathered timber, rather than a manufactured gray.
Here is where it gets interesting. A meaningful number of independent reviewers describe the undertone as blue-gray rather than green-gray, and this is not a fringe view. In cooler light, in rooms with north or east exposure, or alongside blue-leaning whites and cool-toned metals, Cast Iron can pull noticeably toward blue. The two camps are both reporting accurately; they are just working in different rooms and lighting environments. The practical takeaway is that you cannot call this one from a chip. If your room runs cool, budget for the blue-gray possibility. If you are in a warm, well-lit space with wood tones and brass, the sage-green character is more likely to dominate.
What both camps agree on is that the undertone stays muted and complex. This is not a color that shouts any single hue. The interplay between green, gray, and occasional blue-gray is exactly what gives Cast Iron its depth and why it photographs so differently from one space to the next. Pair it with warm materials if you want the green-sage side to win. Lean into cool whites and steel fixtures and you may feed the blue-gray reading instead.
Cast Iron was built for situations where you want a room, a surface, or a facade to hold its ground. Bold kitchen cabinets are one of its highest-profile uses, and for good reason: the depth reads as sophisticated against both warm wood countertops and light stone, and at LRV 12.5 it creates genuine contrast in a kitchen without crossing into black territory. Because the color hides marks and scuffs so well, it is especially practical on lower cabinets in busy households with kids or pets.
On exteriors and front doors it is a strong performer. The dark charcoal with green-gray undertones sits naturally against brick, stone, cedar, and painted wood trim in the same way a classic dark iron fixture does. It suits both modern and rustic architectural styles, and it ages without looking trendy. Reviewers consistently flag it as a go-to for front doors where the goal is serious, quiet impact rather than color-of-the-year flash. On full exterior applications it can feel heavier in shaded elevations, so plan to see it in full sun and shade before you commit.
Indoors, Cast Iron works hardest in living rooms and bedrooms, particularly as an accent wall or full-room commitment in spaces where you want atmosphere over airiness. North-facing rooms should go in with open eyes: the low LRV combined with cool light can make the space feel compressed. South and west exposures handle the darkness more comfortably because stronger natural light gives the color room to breathe. It also works well in spaces where evening use dominates, dining rooms, media rooms, home bars, because warm artificial light flatters it.
Cast Iron on lower or all-perimeter cabinets delivers a bold, grounded look that holds up under daily use. Its low LRV of 12.5 creates strong contrast against light countertops and open shelving, and the dark surface hides fingerprints and scuffs better than lighter cabinet colors. Pair with brass hardware and a warm wood floating shelf to bring the green-sage undertone forward.
A full Cast Iron bedroom feels cocooning and restful in the best way, especially when soft textiles in warm whites and natural linen balance the darkness. The low LRV means the room will feel smaller, so it suits a space where intimacy is the goal rather than an airy, open feel. Evening lighting with warm bulbs flatters it most.
On a single accent wall, Cast Iron anchors a living room with quiet authority and gives art, mirrors, or a fireplace surround a dramatic backdrop. Used on all four walls it creates a moody, den-like atmosphere that works well in spaces with warm wood floors and natural light from at least one generous window. Avoid using it in a small north-facing living room with no supplemental lighting.
Cast Iron is a reliable exterior choice precisely because its dark charcoal with green-gray undertones reads as classic rather than trendy against brick, wood siding, or stone. On a front door it delivers serious, understated impact that suits both traditional and contemporary architecture.
In a room where the primary use is evening or low-light, Cast Iron's depth becomes an asset rather than a liability. It reduces glare and visual distraction on the surrounding walls in a media room, and in a home office it creates the kind of focused, contained atmosphere many people find conducive to concentration. A warm desk lamp and light wood furniture prevent it from feeling oppressive.
Cast Iron pairs most naturally with high contrast and with warmth. The official Sherwin-Williams coordinating palette leans into both directions at once. Frosty White offers a crisp, clean counterpoint that sharpens the edge of the dark charcoal without pulling the scheme cold. Champagne brings warmth, its soft golden-neutral quality connects with any wood tones or brass hardware you bring in and prevents the overall palette from feeling severe. Smoky Salmon is the most adventurous of the three, a muted, dusty pink-coral that works as an accent to soften the room and add just enough warmth to make Cast Iron feel livable rather than brooding.
Beyond the official coordinating picks, Cast Iron responds well to natural materials: raw brass, unlacquered bronze, warm-toned wood in medium to dark stains, linen, and aged leather all complement its earthy complexity. For walls elsewhere in an open-plan space, a soft warm neutral or a calming green-gray in a much higher LRV will bridge the dark anchor without competing with it.
All comparisons are matched against Cast Iron at LRV 12.5.
Pairing Cast Iron with a white that carries a strong blue or violet undertone can push the already-present blue-gray possibility in Cast Iron into territory that feels cold and unwelcoming, especially in north-facing rooms.
All-chrome or brushed nickel hardware and fixtures alongside Cast Iron can amplify the blue-gray undertone and flatten out the color's warmer, earthy complexity, leaving the whole scheme feeling industrial and one-note.
At LRV 12.5, Cast Iron absorbs light rather than reflecting it. In a basement room, a windowless powder room lit only by a single overhead, or a north-facing bedroom with one small window, it can feel oppressive and make the space read as significantly smaller than it is.
Cast Iron is a deep, near-black charcoal with muted green-gray and sage undertones. It reads as a very dark, sophisticated gray on most walls, and at LRV 12.5 it delivers rich depth while stopping just short of flat black.
Sherwin-Williams and our editorial team read Cast Iron as green, gray, and sage. That is accurate in warm and well-lit rooms where the earthy, botanical quality comes forward. However, independent reviewers working in cooler or north-facing rooms frequently report a blue-gray undertone instead. Both observations are real: the color's undertone shifts with light quality and what you pair it with, so swatch it in your actual space before committing.
It sits in the middle. The green-sage component reads as slightly warm and earthy, grounding it in the natural world rather than the industrial one. But in cool light or alongside cool-toned materials, the blue-gray possibility emerges and the color reads cooler. Think of it as a complex neutral that leans slightly warm in ideal conditions and can shift cool when the environment feeds that direction.
Cast Iron has an LRV of 12.5, which puts it firmly in the deep-to-dark range. It reflects very little light, so plan your artificial lighting thoughtfully, especially if you are using it in a room with limited natural light.
The Sherwin-Williams code is SW 6202. The hex value is #64645A and the RGB is 100, 100, 90.
Yes on all three. It is among its strongest uses. On kitchen cabinets the dark depth creates contrast, hides wear, and works with brass hardware and warm wood. On a front door it reads as serious and classic rather than trendy. On full exteriors it suits both modern and rustic architecture and holds up well against stone, brick, and natural wood. Always test large samples in direct sun and shade before committing to an exterior application.
Not exactly. It is in the same family but sits at the very dark end of it. A traditional sage green is much lighter and the green reads clearly. Cast Iron is deep enough that the green character is muted and secondary to the dark charcoal base. In some rooms it reads as barely green at all. If you want an obvious sage, look for something with a significantly higher LRV. Cast Iron is what happens when sage goes nearly to black.
Warm, high-contrast pairings work best. Frosty White is a crisp coordinating white that sharpens the contrast cleanly. Champagne brings warmth and works well with wood and brass. Smoky Salmon adds a muted, dusty warmth as an accent. Beyond paint, Cast Iron loves natural wood, unlacquered brass and bronze hardware, linen and wool textiles, and aged leather. Avoid pairing it with strongly cool-toned whites or all-chrome fixtures if you want the warmer sage-green character to lead.
