I think I never saw a totally black cat. For some reason, the black cats I saw had at least one white hair, or have a different color on the sun light.I have never had an all black cat and would love to have one. They always have the most beautiful shiney coats.
I have a black cat in my courtyard, he's a semi feral. He seems black, but has a couple of white hairs on his coat and his black turns to a very dark brown when the sun shines on him.