Expensive Pink is described as a "pink with duochrome [with a Veluxe Pearl finish]." It's a copper-shimmered coral with a frosted finish. This shade is permanent. It had good color payoff, though the texture wasn't quite as buttery as my permanent single, and it didn't seem as shimmery (which made it appear darker). The color wore well for eight and a half hours. See comparison swatches / view dupes.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.