Stark Congo
Stark Congo (#13561F) 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 (131°, 64%, 21%) 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 magenta. For something softer, pull in its analogous neighbors on either side of the wheel.
Etymology
Old English stearc, stiff / strong — sharing root with German stark and Dutch sterk. As a color modifier, stark implies a deep-and-uncompromising contrast where the hue stands without modulation against its substrate. Sits at the deep-and-formal end of the grid, parallel to severe with sharper visual register.
The central African river and basin — and the saturated deep green of Congo Basin rainforest, the world's second-largest tropical-rainforest system after the Amazon. Congo refers to a Congo Basin canopy in the wet season: a saturated, slightly cool deep green with the matte finish of equatorial-rainforest foliage.
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 exploreHarmonies
Accessibility
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.
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.