Prussian blue or Prussian Blue may refer to: Pigments Prussian blue, a dark blue pigment containing iron and cyanide Prussian blue (medical use), the use of Prussian blue for medical treatment and diagnosis Perls' Prussian blue, a stain used for medical diagnosis Music Prussian Blue (album), a 1973 album by Richard Clapton Prussian Blue (duo), a neo-Nazi white nationalist teen pop duo from California See also Dreams in Prussian Blue, a 2010 novel by Paritosh Uttam, adapted into the film Artist Russian Blue, a cat breed nl:Prussian Blue