Amadeus is like this, too. From what I've read (and I'm no expert) is that he's actually a black tabby. Basically black on black and you can only see it when he's laying in the sun. As he's gotten older he's faded a little bit and you can see it easier now. Elvira started out as a black kitty with just 4 or 5 white hairs on her chest, but now she's turing into a tabby! She's got grey tabby strips coming in on her sides and she's a year old! I've never seen anything like it......