From what I've managed to find out, it was more of a cross between flat and satin finish.
Not to sure as to how accurate the colour match was, but I do recall reading somewhere that a hint of blue was also part of the overall black scheme.
Like I said, not 100% on this, but it kinda makes sense, seeing as night time isn't truely 'black' anyways.
Would also make the scale effect a little more realistic than outright black.
Hope this helps.