Deep cerulean, cerulean, mid cerulean, pale cerulean, cerulean mist
Deep Cerulean
#0F5F8A
rgb(15, 95, 138)
Darkest cerulean — rich, slightly greenish-blue with depth
Cerulean
#1880B4
rgb(24, 128, 180)
Pure cerulean blue — clean, direct, and distinctly sky-influenced
Mid Cerulean
#48AAD4
rgb(72, 170, 212)
Bright mid cerulean — open and almost tropical in character
Pale Cerulean
#90CCDE
rgb(144, 204, 222)
Soft pale cerulean — light and airy, retaining the hue cleanly
Cerulean Mist
#D0E8F0
rgb(208, 232, 240)
Near-white mist — barely-blue, like a clear sky at high noon
Cerulean is a specific blue — not as cool as Prussian, not as warm as ultramarine, not as electric as cobalt. It sits in a particular mid-range of the blue spectrum where sky-influence and water-influence overlap, producing a hue that reads as vivid and open without the aggression of highly saturated pure blues. Cerulean Study isolates that hue and presents a complete five-step tonal scale from deep anchor to near-white mist, making it the kind of complete, self-contained blue system that works across all major design applications without modification.
Deep Cerulean at the palette's dark end is rich enough to use as a primary brand color, a text tone for heading elements, or a productive dark-mode brand accent. It has the additional quality of being slightly more distinctive than standard navy-blue anchors: the green lean in the hue separates it clearly from straight-blue corporate palettes while remaining fully professional. Cerulean itself — the palette's second step — is the pigment color designers reach for when they want a blue that communicates clarity, intelligence, and openness. It translates exceptionally well to print.
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Mid Cerulean and Pale Cerulean handle the palette's middle and fill roles — data visualization bands, card backgrounds, section dividers, hover states, and the kind of background tinting that signals a grouped section in a content-heavy layout without requiring a hard border. Cerulean Mist at the lightest end provides the near-white surface that most blue-primary design systems need: tinted enough to feel intentional, pale enough not to compete with content or dark text colors placed on top of it.
Healthcare technology, environmental reporting platforms, travel media brands, and premium lifestyle design all benefit from cerulean's specific combination of clarity and approachability. This scale translates smoothly between screen and print applications — offset lithography, digital textile printing, and screen-printed packaging all render the cerulean family consistently across their respective gamuts. The five steps provide enough range for complete UI component systems or full editorial design language without external augmentation.
