Prussian Blue#004577, a cool rich blue
Prussian Blue in RGB, HSL, OKLCH & more
Ready to ship: every line pastes straight into your codebase, and the whole file copies at once.
ART is Rhapsody's perceptual model. How ART works
What kind of blue is Prussian Blue?
Every color has a place in the standard vocabulary. This is Prussian Blue's, measured rather than asserted.
Prussian Blue's Munsell numbers: hue 3.9PB, value 2.8 (how light), chroma 7.6 (how vivid). That places it in ISCC-NBS block deep blue, one of 267 named ranges the standard sorts every color into. Chroma 7.6 is moderate. Clearly colored, but not so saturated it fights the colors around it.
It's already at the edge of what your screen can show for this hue. This color can't go any more saturated and still render.
Munsell coordinates and block from the ISCC-NBS system, computed by Rhapsody's own renotation inversion.
Shades of Prussian Blue, lighter and darker
For hover states, washed backgrounds, and dark surfaces that still read as #004577. 13 steps, spaced evenly by eye, with the color itself sitting at its natural depth, prussian-blue-800.
Tints (light surfaces; dark text passes on every one)
Midtones (the color at full strength, for brand & accent work)
Shades (dark surfaces; light text passes on every one)
Most tools mix. Rhapsody measures.
Paste any color. The whole system comes back, contrast-checked before you see it.
The window on the right was generated from #004577, like this whole page.
Is Prussian Blue accessible? Contrast with white & black
Strong contrast makes your work readable by everyone, and meets the WCAG standard accessibility law points at. AA is the floor; AAA is the tier worth aiming for in body text. White text on #004577 clears WCAG AAA. Every strip below is one surface, and the marks are the steps that reach AAA on it.
Rows are text, columns are background · 66 of 210 pairings reach WCAG 2.2 AAA, shown here.
Ship the audit, not screenshots.
Run #004577 against the colors you actually ship, every pairing and any target, and export it: exact ratios, the AA tier, APCA, in one file.
The audit on the right was calibrated from #004577, like this whole page.
Prussian Blue in CMYK: one value for files, one per press
Presses move this color a little, by less than a print run varies anyway, so a printer would call it a match. The pairs below show where each standard lands.
In CMYK, #004577 is . That is the value design tools and file formats use when no press is involved.
On press (what each standard prints)
shifts ΔE00 17.0, 6.8× the 2.5 a run varies by
shifts ΔE00 13.2, 5.3× the 2.5 a run varies by
shifts ΔE00 1.6, under the 2.5 a press run varies by
shifts ΔE00 1.3, under the 2.5 a press run varies by
Press values computed through the ICC characterization data each standard proofs against. Each CMYK above is the closest that standard can get, near enough that a press run's own variation is the larger difference.
No surprises at the printer.
Run any color through the major press standards: FOGRA51, GRACoL, Japan Color, FOGRA39. It's coming soon. Create a free account and you'll get a note the moment it's live.
The strip shows this page's tints and shades on screen, then through a standard GRACoL 2013 conversion.
Colors similar to Prussian Blue
Here are other colors similar to Prussian Blue along with accessible text pairings and whether or not they're print-safe. Explore The Blues
| Twilight Blue | Twilight Blue | #0A437A | white text · AAA | ! within tolerance |
| Darkish Blue | Darkish Blue | #014182 | white text · AAA | ✕ shifts on press |
| Astronaut | Astronaut | #283A77 | white text · AAA | ! within tolerance |
| Marine Blue | Marine Blue | #01386A | white text · AAA | ✕ shifts on press |
| Bay Of Many | Bay Of Many | #273A81 | white text · AAA | ! within tolerance |
| Biscay | Biscay | #1B3162 | white text · AAA | ✕ shifts on press |
| Deep Sapphire | Deep Sapphire | #082567 | white text · AAA | ✕ shifts on press |
| Madison | Madison | #09255D | white text · AAA | ✕ shifts on press |
| Downriver | Downriver | #092256 | white text · AAA | ✕ shifts on press |
| Gulf Blue | Gulf Blue | #051657 | white text · AAA | ✕ shifts on press |
Colors that go with Prussian Blue
The complementary color, straight across the wheel, is a warm medium scarlet #CF7A5A. Rhapsody's pick is the split complement, just to one side of it, a livelier pair.
The accent is for the moments that need attention, the harmony for the ones that need calm; the neutral carries the text and surfaces in between.
Take Prussian Blue with you
The work on this page doesn't stay here. Save a card and the color arrives in your file, your deck or your board already decided.
Your system is already built.
Rhapsody built it before you even asked: the scale, the neutrals, the utilities, every pairing calibrated.
This page's whole theme is built from one color. Palette does the same for yours: every step calibrated, every pairing checked, press included.
Every color on this page was calibrated, not mixed.
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