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Tough Zest Forest

#378f21
Notes

Tough Zest Forest (#378F21) is a true 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 (108°, 63%, 35%) 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 violet. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#378f21
RGB
rgb(55, 143, 33)
HSL
hsl(108, 63%, 35%)
HWB
hwb(108 13% 44%)
OKLCH
oklch(57.5% 0.166 140.2)
P3
color(display-p3 0.3137 0.5534 0.2041)
HSV
hsv(108, 77%, 56%)
LAB
lab(52.47% -46.61 47.44)
LCH
lch(52.47% 66.50 134.50)
CMYK
cmyk(62%, 0%, 77%, 44%)

Etymology

Tough
adjective

Old English tōh, firm / tenacious — sharing root with German zäh. As a color modifier, tough implies a saturated-and-resilient quality where the hue resists fading-and-modulation through its strong pigmentation. Sits at the bold-and-resilient end of the grid, parallel to rugged and hardy in usage.

Zest
modifier

French zeste, citrus-peel-and-bright-tang. As a color modifier, zest implies a bright-citrus-peel-and-aromatic-oil quality, the visual register of Provençal-and-Sicilian-citrus-zest hand-bright-citrus-peel-and-aromatic-oil Provençal-and-Sicilian-citrus-zest-and-Mediterranean-bergamot zest-and-bright-citrus-peel surfaces under Provençal-and-Sicilian-citrus-zest-and-Mediterranean-bergamot Menton-and-Sicily-and-Calabria-citrus-grove citrus-grove-light. Sits at the modifier-and-flavor end of the grid, parallel to tang and bergamot 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.

#378f21
Original
#938209
Protanopia
#887a2d
Deuteranopia
#2b8a7a
Tritanopia
#747474
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
4.11:1
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
5.11:1

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
##378F21
Display P3
Display P3
color(display-p3 0.3137 0.5534 0.2041)
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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