The dark variation is best described as the color of the Byzantine night sky; it resembles dark blue-grey, Prussian and Navy blue, well attested on frescoes and mosaics.
Hex triplet:#2A2F4D
sRGBB (r, g, b):(42, 47, 77)
HSV (h, s, v):(231, 45%, 30%)
CIELChuv (L, C, h):(20.3%, 20.4, 289.7)
HSL (h, s, l):(231, 29%, 23%)
LAB (l, a, b):(20, 7, -19)
Ansi256:60
ISCC–NBS descriptor: Dark purplish bluePublished by: