Dyson hd8 prussian blue hedge. Dyson hd8 Prussian blue is a limited color, so it is more valuable than other colors. Dyson hd8 is an electric hair dryer introduced by Dyson Company. It has seven colors, namely purplish red, China red, purplish red nickel, black nickel, copper nickel, periwinkle blue and Prussian blue. Among them, Prussian blue is a limited selection gift box.