Royal blue (dark)
Royal blue (dark) is #002366, a colour of the blue family. This page gives what can be worked out from the value itself.
Nearest named colours
Harmonies
Contrast with text
White text 14.66:1passes AAA
Black text 1.43:1fails
Ratios follow the WCAG 2 formula. 4.5:1 is the usual minimum for body text.
Through colour-blind eyes
Typical vision
Protanopia
Deuteranopia
Tritanopia
No colour
A simulation of how the colour may look with each kind of colour vision. Real vision varies from person to person.
Where this value comes from
Wikipedia: List of colors. A named colour is not a fixed standard, and other sources may give a slightly different value.