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Stamped Mass Lagoon

#318aab
Notes

Stamped Mass Lagoon (#318AAB) is a true cyan 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 (196°, 55%, 43%) 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 orange. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#318aab
RGB
rgb(49, 138, 171)
HSL
hsl(196, 55%, 43%)
HWB
hwb(196 19% 33%)
OKLCH
oklch(59.5% 0.096 226.7)
P3
color(display-p3 0.2942 0.5339 0.6574)
HSV
hsv(196, 71%, 67%)
LAB
lab(53.78% -15.23 -25.03)
LCH
lch(53.78% 29.30 238.68)
CMYK
cmyk(71%, 19%, 0%, 33%)

Etymology

Stamped
adjective

Old English stempan, to stamp — past-participle of stamp. As a color modifier, stamped implies a clear-and-impressed-and-repeating quality, the crisp color of William-Morris-and-Liberty-of-London block-printed-textile carefully-impressed pattern. Sits at the crisp-and-printed end of the grid, parallel to printed and engraved in usage.

Mass
modifier

Latin missa, Mass-of-the-Eucharist. As a color modifier, mass implies a Eucharistic-and-liturgical-feast quality, the visual register of Roman-Catholic-and-Anglican-Mass Eucharistic-and-liturgical-feast altar-and-vestment-and-incense liturgical-Mass surfaces under Mass-and-Eucharistic-feast altar-candle-and-incense light. Sits at the modifier-and-time end of the grid, parallel to vigil and vesper in usage.

Lagoon
noun

A shallow body of saltwater partially or fully enclosed by a barrier — coral atoll lagoons in the Pacific, Venice's Laguna Veneta, the Florida Keys' backcountry. The color refers to the average reflectance of a calm tropical lagoon at midday: a saturated, slightly muted blue-green with the optical clarity of shallow water over white sand. Brighter than reef, cooler than aquamarine, with the postcard weight of a Pacific atoll seen from above.

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.

#318aab
Original
#7887ad
Protanopia
#687bab
Deuteranopia
#009495
Tritanopia
#797979
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).
AA Largeon White
3.92:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAon Black
5.35:1

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
##318AAB
Display P3
Display P3
color(display-p3 0.2942 0.5339 0.6574)
P3 has subtle headroomOKLCH chroma 0.096

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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