When I first started cycling again a few years back I replaced the old tyres with some red walled tyres.They looked great new ,but they soon started to look grotty..With the great British winter with salt on the roads , oil flinging off the chain set they went to look absolutely filthy, and no matter how much cleaning and scrubbing they would never clean up.
Tan wall tyres will go the same way,
They do look rather classy though and look much better than just plain black when new,but I stick to all black tyres now as they seem to keep their good appearance for longer.