זכריה ו:ג פירוש: רש״י

white To cause Persia to mount, and Persia built the Temple.

spotted They are spotted. [Their function is] to cause Greece to mount, [as Greece] oppressed Israel with various kinds of decrees

ash- colored to cause Edom and Ishmael to mount, but I do not know the expression אֲמֻצִּים. Jonathan rendered: ash-colored.