The reason that black doesn't photograph well, is that it isn't a colour, it is a total lack of reflected light, and cameras do like to search for a colour, therefore cameras have to find some way of identifying it, hence the blue, because that's the nearest colour, tonally.
Science lesson over!
Having said all that, nice job, Pete. I like the aged appearance of them. I think that I prefer the first of them, if I had to choose.
Les