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Firm Cape Forest

#218518
Notes

Firm Cape Forest (#218518) is a deep green with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (115°, 69%, 31%) places it in the balanced band at a dark lightness. It works well as a headline, icon, or deep background in an otherwise light layout, pairing cleanly with cream, bone, and warm neutrals. For a confident two-color system, pair it with its complementary violet. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#218518
RGB
rgb(33, 133, 24)
HSL
hsl(115, 69%, 31%)
HWB
hwb(115 9% 48%)
OKLCH
oklch(54.0% 0.168 142.0)
P3
color(display-p3 0.2580 0.5140 0.1739)
HSV
hsv(115, 82%, 52%)
LAB
lab(48.47% -48.47 46.41)
LCH
lch(48.47% 67.10 136.25)
CMYK
cmyk(75%, 0%, 82%, 48%)

Etymology

Firm
adjective

Latin firmus, strong / stable — sharing root with English farm (originally a fixed-yearly-rental). As a color modifier, firm implies a saturated-and-resolute quality where the hue holds its visual position without wavering. Sits at the bold-and-firm end of the grid, parallel to steadfast and unwavering in usage.

Cape
modifier

Latin cappa, hooded-cloak. As a color modifier, cape implies a hooded-cloak-and-shoulder-cape quality, the visual register of Spanish-capa-and-Italian-cappa-magna hand-hooded-cloak-and-shoulder-cape Spanish-capa-and-Italian-cappa-magna-and-Portuguese-capa cape-and-hooded-cloak-and-shoulder-cape surfaces under Spanish-capa-and-Italian-cappa-magna-and-Portuguese-capa Iberian-and-Italian-Renaissance Iberian-cape-light. Sits at the modifier-and-textile end of the grid, parallel to cloak and cope in usage.

Forest
noun

The dense canopy of a temperate or tropical woodland — oak, beech, pine, eucalyptus, mahogany — wherever leaves close above to filter the light below. Forest green refers to the average reflectance of a healthy mid-summer canopy seen from below: a saturated, slightly muted green with the matte finish of layered chlorophyll. Deeper than fern, cooler than olive, with the ecological weight of a word that has named every wooded biome on Earth.

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.

#218518
Original
#887800
Protanopia
#7d7025
Deuteranopia
#008171
Tritanopia
#686868
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).
AAon White
4.74:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AA Largeon Black
4.43:1

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
##218518
Display P3
Display P3
color(display-p3 0.2580 0.5140 0.1739)
P3 has subtle headroomOKLCH chroma 0.168

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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