It was envisaged the setting color version of the black & white as Cigars of the Pharaoh. But the face of criticism (too british style for a story set in a Slavic country) Hergé was brought with the help of Edgar P Jacobs to overhaul the Syldavian part of this story in "balkanizing" the guards Castle Kropow.
An album that is worth seeing with the presence of the Black & white and full frame coverage versions.