A Platinum English Bulldog is entirely white, with the absence of ANY color. From ears to tail, there will be no color to their coat.
Even the smallest amount of color showing, whether it be on their face, back, tail, etc., is not a true platinum English Bulldog. Platinum Bulldogs in the rare colors (black, blue, chocolate) are extremely hard to find.
Our Blue Platinum, Lavia, is a very good example of a true, genetically rare color (Blue) Bulldog, that is entirely white, other than the pigment of her nose and lips, which are obviously blue.