Dark Slate Grey is the CSS named color #2F4F4F — rgb(47, 79, 79), hsl(180, 25%, 25%). Its relative luminance is 0.068, giving 8.93:1 against white and 2.35:1 against black, so it works as a text color on white.
| HEX | #2F4F4F |
|---|---|
| RGB | rgb(47, 79, 79) |
| HSL | hsl(180, 25%, 25%) |
| Relative luminance | 0.0676 |
| Contrast on white | 8.93:1 AA pass |
| Contrast on black | 2.35:1 AA fail |
Built by mixing darkslategrey toward white (four steps) and toward black (four steps) while keeping the hue. Use the shades generator for a different step count or to add harmony sets.
Closest by CIELAB distance (ΔE76). For perceptual matching in a design system, compare in OKLab before locking a token.
darkslategrey is #2F4F4F, which is rgb(47, 79, 79) and hsl(180, 25%, 25%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Dark Slate Grey has a relative luminance of 0.068 on a 0–1 scale, so it is a dark color. Against white it scores 8.93:1; against black, 2.35:1.
darkslategrey reaches 8.93:1 against white, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.