I honestly have no idea. The guy I bought him from said pastel and I went with it until someone mentioned clear bellies in pastels. It really does matter to me - 's got a nice temperament, he eats well, I like him and he's visually different than the normal so I'm more than happy. I got him from a guy on craigslist who got him from a guy on craigslist who - got him from who knows where. His background's a big old question mark.
I'll just change my signature to 'I dunno, YELLOW' when I get around to it. ;-)