Yeah. It's an extremely rare type that apparently requires poor care. If someone knows exactly how to get it, either they aren't telling, or I haven't come across that person.
I don't know if it changes back. It's one of those secret dragons you're not supposed to talk much about on the Dragcave forums.
My scroll, and its dragons:

The white egg was saved. Thanks!
EDIT: Here's a recent topic about, for those curious:
This goes to the DragCave forums. No one actually says how to get it, though, as per the rules. We do all "omgbbq!" over it and the fact that it used to be a gold, though.