A Carolina corn is basically a normal. If it isn't het for anything, then breeding it with a snow will produce 100% normals, het for snow (amel & anery). Your Carolina could very well be het for amel or anery, or both, though. In this case (het for both), breeding it with a snow may produce amels, anerys, and snows as well as normals. You won't know what the normal is het for until you breed him/her.