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Certain Caper Ultramarine

#3841aa
Notes

Certain Caper Ultramarine (#3841AA) is a true blue with an earthy character. It leans grounded and natural, the kind of color that plays well with wood, clay, linen, and warm neutrals. Its HSL profile (235°, 50%, 44%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary yellow. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#3841aa
RGB
rgb(56, 65, 170)
HSL
hsl(235, 50%, 44%)
HWB
hwb(235 22% 33%)
OKLCH
oklch(43.4% 0.166 273.5)
P3
color(display-p3 0.2263 0.2538 0.6426)
HSV
hsv(235, 67%, 67%)
LAB
lab(32.97% 30.92 -57.49)
LCH
lch(32.97% 65.28 298.27)
CMYK
cmyk(67%, 62%, 0%, 33%)

Etymology

Certain
adjective

Latin certus, fixed / sure — sharing root with English concern and certify. As a color modifier, certain implies a saturated-and-unambiguous quality where the hue declares its character without hesitation. Sits at the bold-and-confident end of the grid, parallel to assured and decisive in usage.

Caper
modifier

Greek κάππαρις, Mediterranean-pickled-bud. As a color modifier, caper implies a Mediterranean-pickled-bud-and-briny-tang quality, the visual register of Pantelleria-and-Sicilian-caper hand-Mediterranean-pickled-bud-and-briny-tang Pantelleria-and-Sicilian-caper-and-Aeolian-Islands caper-and-Mediterranean-pickled-bud surfaces under Pantelleria-and-Sicilian-caper-and-Aeolian-Islands Pantelleria-and-Aeolian-and-Sicilian Mediterranean-brine-light. Sits at the modifier-and-flavor end of the grid, parallel to anise and tang in usage.

Ultramarine
noun

The pigment ground from lapis lazuli — the Afghan mineral imported through Venice in the late Middle Ages, more expensive by weight than gold during the Renaissance. The color refers to a freshly mixed ultramarine pigment in linseed oil: a saturated, slightly violet-shifted deep blue with the matte finish of micron-ground rock. Deeper than cobalt, cooler than royal, with the art-historical weight of the blue Vermeer reserved for Mary's robe.

Closest matches

The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.

Variations

Click any swatch to explore

Harmonies

Accessibility

Color-vision simulation

How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.

#3841aa
Original
#0053ad
Protanopia
#0048a8
Deuteranopia
#005b6f
Tritanopia
#474747
Achromatopsia
WCAG contrast

The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.

The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAAon White
8.38:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon Black
2.50:1

Wide gamut

Display P3 representation

The CSS Color 4 wide-gamut form of this color. Both swatches render the same color on every display — the P3 form only diverges from sRGB when a designer pushes channels outside sRGB's reach.

sRGB hex
sRGB hex
##3841AA
Display P3
Display P3
color(display-p3 0.2263 0.2538 0.6426)
P3 has subtle headroomOKLCH chroma 0.166

Moderately saturated colors gain a small bump in P3 — the difference is usually visible side-by-side on wide-gamut hardware but won't change the character of the color.

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Canvas