Constellation Blue
T18-18 · #3C4670 · LRV 7 — cool blue tone, very dark — reads black in most rooms.
- 1Nightlife2
- 2Constellation Blue7
- 3Waterloo13
- 4Charcoal Blue19
What Color Is Constellation Blue, Really?
Constellation Blue reads as a cool blue tone — very dark — reads black in most rooms. The notes below cover how Behr T18-18 behaves in different light and the closest matches at competing US brands.
Best Rooms and Uses for Constellation Blue
Constellation Blue earns its keep as a statement: accent walls, a front door, cabinetry, a moody powder room, or exterior trim where you want sharp contrast. Blues calm a room, which makes them popular in bedrooms, bathrooms and home offices.
How Lighting Changes Constellation Blue
At LRV 7, Constellation Blue is about as dark as paint gets — it reads near-black on a wall and reveals its character only in direct daylight or under warm bulbs. Its blue undertone is the part to watch: it gets picked up by whatever sits next to it, so test it against your trim, floor and the room's main light before committing. In rooms with little natural light it can feel heavy, so reserve it for spaces you want to feel enveloping.
Most complaints about Constellation Blue are a light mismatch. Upload a photo of your actual room and see it on your walls — then ask for the same wall in north light or evening lamps before you buy a single sample.
Need It From Another Brand?
Any paint counter can custom-tint Behr T18-18 directly. If you would rather stay in one brand's own deck, these are the closest stock matches, measured as ΔE2000. Under 2 is a difference you will not see on the wall.
| Brand | Closest color | ΔE | LRV | |
|---|---|---|---|---|
| Sherwin-Williams | Valiant VioletSW 6818 · Sherwin-Williams | 1.8 | 6 | Color page → |
| Benjamin Moore | WizardCC-966 · Benjamin Moore | 1.5 | 8 | Color page → |
| Valspar | Skyline8003-47G · Valspar | 3.3 | 6 | Color page → |
| PPG / Glidden | Daring IndigoPPG1166-7 · PPG / Glidden | 1.9 | 7 | Color page → |
| Glidden | Daring IndigoPPG1166-7 · Glidden | 2.1 | 7 | Color page → |
| Dutch Boy | Inky Blue241-7DB · Dutch Boy | 2.1 | 7 | Color page → |
Similar Behr Colors
The nearest shades to Constellation Blue within Behr's own range, ranked by perceptual color distance — useful when you want the same look a touch lighter, darker, or warmer.
WCAG 2.1: AA is 4.5 : 1 for normal text, 3 : 1 for large text, AAA is 7 : 1.
Coordinated palette
Generated by hue-rotating #3C4670 in HSL space. Pair Constellation Blue with one accent and one neutral — the swatches below are starting points, not final picks.
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