Platinum, sometimes referred to as "Fire," is the visual het for either Leucistic, or Ultra Ivory.  This means there are actually 2 known lines of Platnum, and when bred together, these will produce Ivories.  Platinums are identified by subtle changes in pattern, and an overall lightening of the base color of the snake.  Sometimes difficult to distinguish from normals at birth, anything with the Platinum gene will get more and more intense as it ages, growing into a beautiful lemon yellow and black animal.