On this page about Persian blue:
Persian blue comes in three shades: Persian blue proper—a bright medium blue; medium Persian blue (a medium slightly grayish blue that is slightly indigoish); and a kind of dark blue that is much closer to indigo; this darker shade of Persian blue is referred to as Persian indigo or dark Persian blue.).
Please refer to any of the following articles on subjects termed Persian or related: Persia Persian (pastry) Persian (Pokémon) Persian appel dessert Persian art Persian barrenwort Persian Bells Persian berry Persian blinds Persian blue Persian buttercup Persian calendar Persian carpet Persian...