Rudimentary Squirrel
Rudimentary Squirrel (#57515A) is a deep neutral with a mono character. It's a grayscale value, at home in typography, dividers, and the structural layer beneath stronger colors. Its HSL profile (280°, 5%, 34%) places it in the muted band at a dark lightness. It works as a background, hairline border, or text color in dark UI. Swap to true black when you need maximum contrast. Pair it with almost any saturated accent. It's built to sit underneath or behind stronger colors without fighting them.
Etymology
Latin rudīmentum, first principle — adjectival suffix -ary. As a color modifier, rudimentary implies a neutral-and-basic-and-stripped-down quality where the hue carries the visual register of prehistoric-and-cave-art rudimentary-and-foundational-mineral-pigment color-decision. Sits at the neutral-and-foundational end of the grid, parallel to basic and primal in usage.
Sciuridae family — particularly the Sciurus carolinensis (eastern gray squirrel) of North-American deciduous-and-mixed woodlands. Squirrel color refers to a Sciurus carolinensis dorsal-fur field in raking late-autumn-light: a balanced cool gray with the matte finish of agouti-banded short-undercoat-and-guard-hair fur with the characteristic mid-gray squirrel coloration.
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.
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.