Kicking around ideas, I know that a person can take a narrow whitewall and carefully grind away the thin black layer to make it a wide white wall. For a Raised White Letter tire, is the white layer that forms the letters on top of the black, which would let you carefully grind away the letters leaving a nice, slick blackwall with no ID? It would not be good to grind them away finding white below, making a ugly white blob on the sidewall...