Many thanks for the information.
I usually use Tamiya "NATO Black" to represent black or blackish paint
on ships, it's a very dark grey (almost black) with a slight
bluish/greenish tint. This would probably be a good paint to use
considering the real paint's name was "Dunkelblaugrau" (dark blue-grey)
www.prinzeugen.com appears to be down at the minute, I was originally
intending to check the Schnellboot section of this website to see if I
could find the answer to my question before posting here!