Originally Posted by cxwrench

That's one of the dumbest ideas I've ever hears. First you want to use the pads recommended by the rim manufacturer. Some are black, some are grey (Zipp), some are red (Roval), some are blue (Envy/Reynolds). If the rim manufacturer doesn't provide or recommend a specific pad then I'd use either Zipp (grey) or Swissstop Black Prince. Carbon rim braking surfaces wear very little but you can get pad material deposits on the rim. If they aren't causing any noise leave them alone.