Cascade Twilight

Little light comes back off a wall this dark, so the blue mostly lives in memory and in direct light rather than in a glance across the room. Vista Paint catalogs it as Cascade Twilight, 7325.

With an LRV this low (10.0), a room relies entirely on its fixtures; the paint gives nothing back. Under warm light it softens; under daylight bulbs it goes hard and flat, with the blue only really visible in the warmer of the two.

Worth checking before committing to a full wall: oranges and warm terracotta nearby - in a floor, a rug, a piece of furniture - will read as a clash here, not a complement, since the two colors sit at opposite ends of the spectrum.

Warm metals - brass, aged gold, unlacquered fixtures - gain a contrast against this that they do not have against a lighter wall; it is a common reason people choose a color this deep in the first place. The safest multi-color scheme moves from this dark wall to a noticeably lighter secondary tone, then to a near-white ceiling - three genuinely different depths rather than three shades of the same idea (LRV 10.0, 48 and 85, if you're matching by the numbers).

A single accent wall opposite the main window lets daylight hit it directly, which is where a color this dark actually shows its undertone. Sherwin-Williams Practical Beige makes a good second wall color here - different enough to read as a real choice, close enough to still feel related (about 36.4 points apart in light reflectance).

Eggshell can work if the wall is in excellent condition, but matte is the more forgiving default for a color at the bottom of the scale.

For anyone tied to a different brand, Behr Running Water (S-G-580) is the nearest stand-in, at a delta-E of 1.66. Only 2 other-brand colors land within delta-E 2 of this one, which makes it comparatively unusual.

It is lighter than 5 percent of the Vista Paint range. This is a crowded part of the scale - 533 colors measure within a point of 10.0 - so most brands will have something close. Vista Paint lists it in the K codes, alongside 1,318 other colors.