Blood red
#660000
| HEX | #660000 |
|---|---|
| RGB | 102, 0, 0 |
| HSL | 0°, 100%, 20% |
| CMYK | 0%, 100%, 100%, 60% |
| Relative luminance | 0.03 |
Text contrast
On white
13.42:1 Passes AA
On black
1.56:1 Below AA
Colours that work with it
Complement
Analogous
Triadic
Shade scale
Seen with colour blindness
How to read this
- A hex code writes red, green and blue as two hexadecimal digits each. #ff0000 is red at full strength and the others at zero.
- HSL states hue (0–360°), saturation and lightness. Nudging a colour brighter means changing one number, which is why it is easier to work with by hand.
- Text contrast follows WCAG. Body-size text needs 4.5:1 or better, and 21:1 between white and black is the maximum possible.
- The colour-blindness row computes how this colour appears under three types of colour vision deficiency — the reason never to encode information in colour alone.
Frequently asked questions
Q. What is the hex code for Blood red?
#660000. That is 102, 0, 0 in RGB, and hue 0°, saturation 100%, lightness 20% in HSL.
Q. Should text on Blood red be white or black?
White. Contrast against white is 13.42:1 and against black 1.56:1, so take the higher one if body-size text has to be readable.
Q. What is the complement of Blood red?
#006666, sitting 180° across the colour wheel. Side by side the two push against each other hardest, which makes it a good accent but tiring over large areas.
Q. Can I send these CMYK values straight to print?
The computed values are C 0% · M 100% · Y 100% · K 60%. Real printing depends on paper and ink, so check against the printer's swatch book when the colour matters.
Q. Is this colour distinguishable with colour blindness?
It appears as #3A3900 with protanopia, #404700 with deuteranopia and #610000 with tritanopia. Where those values converge with another colour, add a shape or a label instead of relying on hue.