Late to the party, but I figured I'd help out with seeing the blue and black for you guys.
I was speaking to a friend about which he saw (he saw blue black and I white gold) and he mentioned something very interesting: he doesn't see shadows on white objects as being blue coloured when in the shade surrounded by sunlight. Of course, we all know this happens. Stick white in some shade outside during the day and it will go blue, but he doesn't see that and I had to explain it to him. Clearly his brain is just doing more correction than mine is. I see blue and I know that means white, but I've never been under the illusion that shadow is grey.
So my assumption (sorry) is that I simply cannot see blue black purely because my brain doesn't see a need to correct the image.
Which of course got me thinking, "Let me just mess with the colour balance!" and here we go:

I literally just took the blue-yellow slider and shoved it in both directions and this happened.
In both of these pictures I, unequivocally, see blue black (although I can still imagine white gold of course), because my brain is being forced to correct for colour in both.