Assuming that "By-Road" is a typo and you meant to type "Hy-Road" ---
Since the standard color scheme is blue/black, and since it a hybrid of solid/pearl, assuming the black is the solid and blue is the pearl, pouring such a mixture can result is differing proportions of black (solid) and blue (pearl). If one is mostly black, I'd assume it is mostly solid. Just an accident of the pouring process.