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Ask 100 average footie fans what colour they associate with Cardiff and I doubt very many would say red, if any. Selling your history and you soul is a personal choice, but it's not for me.
Sports psychologists have long pontificated that red is the "dominant" colour but a lot of non-reds have won the European Cup like Inter, Celtic, (spit), Ajax, (ostensibly white with a red stripe), Feyenoord, Villa, Hamburg, Juventus, Steau Bucharest, Porto, Marseille, Borussia Dortmund and, finally, Barca - a mixture of blue and red.
The UEFA Cup is even more non-red with the top winners being Juventus (3), Internazionale (3), Liverpool (3), Borussia Mönchengladbach (2), Tottenham Hotspur (2), Parma (2), Porto (2), Real Madrid(2), IFK Göteborg (2) and Feyenoord (2), with only one famous Red among them.
Personally, I believe that the best team wins in 99% of cases, and red is more a common choice rather than a dominant colour. The lack of it certainly hasn't held Brazil, Italy Argentina or Germany back in the World Cup, or have Wales been holding out on us?
By the way, I meant foreign as I have no idea what foregin is.