The club have produced over 90,0000 cards which will initally show the message ‘We Color’ Football’ in yellow on a blue background.
The card will then be flipped over to reveal the same message on top of Barca’s blaugrana colours on one side, and the colours of the Catalan flag, the Senyera on the other.
It should look a little something like this:
Sunday’s match will, as always, be one of the most eagerly-anticipated games in the football calendar.
Barcelona come into the game four points clear of their rivals, with manager Julen Lopetegui under pressure after a tough start to the season.