Sufficiently Kachikoshi
Sufficiently Kachikoshi (#1C171D) is a deep violet 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 (290°, 12%, 10%) places it in the muted 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 green. For something softer, pull in its analogous neighbors on either side of the wheel.
Etymology
Latin sufficiēns, enough — adverbial-and-adjectival suffix -ly. As a color modifier, sufficiently implies a neutral-and-enough-and-satisfactory quality where the hue carries the visual register of enough-and-satisfactory-and-fitting coordinated color-decision matched to its functional requirement. Sits at the neutral-and-traditional end of the grid, parallel to adequately and appropriately in usage.
Japanese 褐返, charcoal-overdye — a late-Edo-period color name for the deep-iron-gray of kachi-iro (vat-blue)-overdyed-on-charcoal cotton, popular among samurai-class everyday wear. Kachikoshi color refers to a samurai-class kachikoshi-dyed Edo-komon fine-pattern cotton: a dark blue-gray with the matte finish of multi-bath aizome-and-charcoal overdye on commoner cotton.
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
This color has effectively no chroma (OKLCH C = 0.014) — it’s on the grayscale axis. Hue rotations don’t change a grayscale color, so complementary, analogous, triadic, and split-complementary all reduce to the same value. They aren’t shown because four identical tiles would be misleading.
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.
Wide gamut
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.
This color sits well within the sRGB cube. P3 and sRGB share the gray axis and most desaturated tones, so a P3 display renders this identically to an sRGB display.