Sea Serpent

SW 7615 · Sherwin-Williams

Sherwin-Williams

Sea Serpent

SW 7615

Hex code

#3E4B54

Light reflectance value (LRV)

6.7Very dark, close to black on a wall

0 black100 white

Undertone

Subtle blue, a cool color

Color family: Neutral
Sold for: Interior and exterior

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Sherwin-Williams Sea Serpent SW 7615 is a very dark blue-gray, measured cool with a subtle blue undertone, the color that ends the strip beginning with Olympus White SW 6253. Its LRV of 7 puts it at near-black depth, so in most rooms it reads as a navy-black and shows its blue where daylight is strong. It is chosen for kitchen cabinets, front doors and exteriors by people who want a dark that is clearly blue without being a bright navy.

Updated September 2, 2026

Is Sea Serpent warm or cool? Undertones by the numbers

leans blue

Undertone

Subtle blue

graysaturated

A gentle lean, quiet on the wall.

Sea Serpent measures cool with a subtle blue undertone, enough blue to be seen without contrast in daylight and the reason it counts as a blue-gray rather than a charcoal. Beside white trim it is plainly blue; beside a real navy it looks gray, and beside oak or brass the blue deepens by contrast. That is the split with the neutral darks. Iron Ore SW 7069 and Tricorn Black SW 6258 carry no lean, so next to either Sea Serpent reads unmistakably blue and they read black. Cyberspace SW 7076 sits halfway, with about half the blue. Naval SW 6244 goes the other way, a fuller navy, darker and bluer. Its nearest matches are Tarragon SW 9660 and Gale Force SW 7605, one a hair grayer and one a hair bluer.

Sea Serpent in north, south, east and west light

Sea Serpent is happiest in a south-facing room, where warm light balances the cool lean and it reads truest to the chip, a deep blue-gray. West rooms are flat in the morning and at their best in the afternoon. East rooms are soft at breakfast and cooler through the day. A north-facing room stacks cool light onto a cool color: the walls go bluer and flatter, and a small north room can feel chilly. Sample it on the darkest wall first and give it warm lamps. Bulbs at 3000K are the safe middle; 2700K warms it, and 4000K pushes it plainly blue.

Watch for

In a north room it turns bluer and flatter and can make a small room feel cold.
4000K bulbs push it to a plain blue at night; 3000K keeps it blue-gray.
Against orange oak the blue jumps forward by contrast, which some people like and some do not.

Best rooms and surfaces for Sea Serpent

Sea Serpent is a cabinet and door color before it is a wall color. On kitchen cabinets it gives a deep blue-gray that reads navy in daylight and near-black at night. It pairs with white quartz, marble, a white subway backsplash and brass or nickel pulls, and the brass version is the one most people picture. A vanity or an island in it is the easier commitment. On four walls it suits a bedroom, office or dining room with a big window, where the blue reads as calm; in a small room it closes in. An accent wall behind a bed works with Ice Cube SW 6252 elsewhere. It sits well with white oak, marble and light gray floors; with terracotta and orange wood the contrast is loud, and a windowless bathroom turns it black.

Sea Serpent on an exterior

Sea Serpent is rated for exterior use, and outdoors it reads as a deep blue-gray rather than a black. Full sun lifts it and shows the blue plainly, so a whole house in it looks slate-blue by day and near-black at dusk. The shaded side keeps more of the chip's gray. It suits a gray roof, trim in Ice Cube SW 6252 or Extra White SW 7006, and stone or painted brick. On a front door it gives the navy-black people want against white, cream or pale gray siding, and it reads bluer there than Cyberspace SW 7076 would.

Try Sea Serpent on your own walls

Upload a photo of your room, or the outside of your house, and TryMyHome renders Sea Serpent onto the walls so you can judge it in your light, with your floors and furniture. Your first five renders are free.

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Sea Serpent vs Naval, Cyberspace and Iron Ore

Living room walls rendered in Sherwin-Williams Naval SW 6244, white trim, ceiling and wood floor unchanged

Sea Serpent vs Naval SW 6244

Sea Serpent is a touch lighter; undertone subtle blue vs noticeable blue.

Naval SW 6244 is a step darker and a fuller navy where Sea Serpent is a blue-gray. On cabinets or a door Naval reads as navy in every light; Sea Serpent reads navy in daylight and slips toward charcoal in the evening. Pick Naval when the blue must be unmistakable. Pick Sea Serpent when you want the blue to show but not to shout, or when the room already has strong color elsewhere.

Living room walls rendered in Sherwin-Williams Cyberspace SW 7076, white trim, ceiling and wood floor unchanged

Sea Serpent vs Cyberspace SW 7076

Sea Serpent is a touch lighter; undertone subtle blue vs faint blue.

Cyberspace SW 7076 is the same depth, an LRV of 6, with about half the blue. It measures neutral with a faint blue lean where Sea Serpent measures cool with a subtle one. On a wall Cyberspace is a charcoal with a cool edge and Sea Serpent is a blue-gray. Choose Cyberspace to stay in the neutral family with a hint of cool. Choose Sea Serpent to make the color read as blue.

Living room walls rendered in Sherwin-Williams Iron Ore SW 7069, white trim, ceiling and wood floor unchanged

Sea Serpent vs Iron Ore SW 7069

Sea Serpent is a touch lighter; undertone subtle blue vs none (a true neutral).

Iron Ore SW 7069 is a hair darker, an LRV of 6, and a true neutral: a soft black with no blue in it. Beside it Sea Serpent looks plainly blue. Pick Iron Ore for a scheme with warm wood, brick or brass, where blue would fight the materials. Pick Sea Serpent for white, marble, gray and nickel, or wherever you want a dark that is a color rather than a black.

Questions about Sea Serpent

Is Sea Serpent blue or gray?

Blue-gray, leaning blue. It measures cool with a subtle blue undertone, so beside a white or a neutral dark it reads blue. Beside a true navy such as Naval SW 6244 it reads gray. In a north-facing room it goes bluer; under warm lamps at night it goes grayer. Sherwin-Williams files it in the neutral family, but few people would call it one on a wall.

What colors go with Sea Serpent?

Sherwin-Williams pairs it with Ice Cube SW 6252 for trim and ceilings and names Lullaby SW 9136 and Uncertain Gray SW 6234 as accents, both lighter blue-grays. Its own strip supplies the rest: Lazy Gray SW 6254 or Morning Fog SW 6255 on the other walls. Beyond paint it suits white oak, marble, white quartz, brass and nickel.

Is Sea Serpent a good cabinet color?

Yes, and cabinets are its most common interior use. On doors it reads as a deep blue-gray, navy in daylight and near-black at night, and it sits well with white quartz, marble and brass or nickel hardware. Keep the walls light and cool, Ice Cube SW 6252 for example, so the blue reads as the room's one color, and give the doors a satin finish.

Is Sea Serpent good for a front door?

Yes. It is rated for exterior use, and on a door it gives the navy-black that suits white, cream and pale gray siding, reading bluer in sun than in shade. Against red brick the blue is a strong contrast, which can be the point. Semi-gloss shows the color best and wipes clean; brass hardware warms it, black hardware keeps it quiet.

What is one shade lighter than Sea Serpent?

Gibraltar SW 6257 is the next color up the fan-deck strip, a jump from an LRV of 7 to 14 that reads as a mid-dark blue-gray. Sea Serpent is the darkest on its strip; for darker, Naval SW 6244 is the usual step. Among its closest matches, Tarragon SW 9660 is a near twin, a hair lighter and grayer.

Get a sample before you paint

Use the visualizer to narrow your shortlist, then confirm the finalist on your actual wall. A peel-and-stick sample of Sea Serpent, checked in morning and evening light, is the last step before a gallon.