Blood Red sits in the warm red family, with the hex code #660000 mapping to rgb(102, 0, 0) in RGB and hsl(0, 100%, 20%) in HSL. In OKLCH it carries 32% perceptual lightness and 0.132 chroma — a moderately saturated, dark reading that behaves well as a primary, accent or decisive colour in modern interfaces. Red is the most physiologically arousing hue — it raises heart rate, sharpens attention and signals urgency. Designers reach for it when a screen needs to feel decisive, appetising or emotionally charged.
Red is the most physiologically arousing hue — it raises heart rate, sharpens attention and signals urgency. Designers reach for it when a screen needs to feel decisive, appetising or emotionally charged.
Reds with high chroma vibrate against pure black. Cap saturation around 60% on dark UIs and always pair red text with body sizes ≥ 16px to keep WCAG AA on white.
#660000rgb(102, 0, 0)hsl(0, 100%, 20%)hsv(0, 100%, 40%)lch(19.87% 51.44 36.73)oklch(32.04% 0.1315 29.23)lab(19.87% 41.23 30.76):root {
--color: #660000;
--color-rgb: rgb(102, 0, 0);
--color-hsl: hsl(0, 100%, 20%);
--color-oklch: oklch(32.04% 0.1315 29.23);
}How blood red performs as foreground text on common surfaces, scored with WCAG 2.1.
Tints are produced by mixing blood red with progressively more white.
Shades are produced by mixing blood red with progressively more black.
Tones are produced by mixing blood red with progressively more gray, lowering chroma while keeping lightness.