^^ In those dark colours, which I love, on the castle, the effect in the daytime, may be "darker" than Disney intended.
That said, it would be a perfect colour for maybe the never-to-be-built WDW ~Villains' Park Castle~
....hmmm? Which would
then look awesome in the day time. Still dark and forboding...and pure villany! (Yep, that's a blood red colour to me, guys.)